Helmets

The Fixture MIPS brings confident mountain bike style and breezy ventilation together in a compact design that complements nearly any ride -- especially when there's dirt under tread. Some of Giro's best features, like In-Mold construction coupled with the ease and comfort of their acclaimed Roc Loc Sport fit system, offer the versatility you need to ride everything from fire-road adventures to swooping singletrack trails. The Roc Loc also is seamlessly integrated with the Multi-Directional Impact Protection System (MIPS), which can redirect energy and provide more protection in certain impacts.

At just 850 grams, the Sanction is our low-profile full-face helmet aimed at dirt shredders and BMX riders who don’t need the more robust Full-9 or Transfer-9. The Sanction has become the choice of adults who want full-face protection but prefer a smaller size and profile. If you’re riding a chairlift, go with a Full-9 or Transfer-9. But if you’re pedaling BMX or dirt jumps, this helmet will serve you well.

The Super Air is the first trail helmet to offer Flex Spherical + MIPS, making it our most advanced trail helmet. Period. This combination of outstanding safety, optimized ventilation and extreme lightness brings epic achievements within reach — on any trail, in any terrain. When you’re ready to step up, upgrade by adding the optional chin bar. See you on the trail! - 18 vents, 4 brow ports - Overbrow ventilation features intake ports on the brow of the helmet to usher in cool air and push it through the air-channel matrix for full-head ventilation - Compliance: CPSC bicycle - Flex spherical + MIPS - comprehensive energy management - flex spherical enhances our ability to address high-speed impacts, low-speed impacts, as well as rotational impacts. Think of it as comprehensive protection, with the added bonus of being able to design better helmet ventilation. - Construction: Fusion in-mold polycarbonate shell - a process pioneered by Bell bonds the helmet's outer shell to the EPS foam liner to create a sturdier helmet. - Progressive layering: the process of engineering a helmet liner with variable EPS foam densities to better manage the transfer of energies after some impacts - Fit System: Float fit - a minimalist, lightweight fit system with an easy-to-turn rubber overmolded dial for adjustments (integrated with MIPS) - Interior: Sweat guide pad design pulls moisture away from the brow pad and away from eyewear

Among the Manifest's extraordinary features is Spherical Technology, which utilizes a ball-and-socket design powered by MIPS, the market-leading brain protection system that helps to reduce rotational forces. Spherical Technology allows the outer liner to rotate around the inner liner during a crash and also eliminates contact with a hard-plastic slip-plane. In addition to leading head protection, the Manifest offers wide-open airflow thanks to the AURA reinforcing arch, which bolsters structural integrity while allowing air to flow into the massive Wind Tunnel vents. You'll also get a comfortable, secure fit with the easy fit and positioning adjustments built in to the Roc Loc Trail Air fit system and plush, antimicrobial XT2 padding for exceptional sweat absorption. - Spherical Technology's Ball-and-Socket design, powered by MIPS, helps redirect impact forces away from the brain by allowing the outer liner to rotate around the inner liner during a crash. It also eliminates contact with hard plastic or slip-planes against the skin. - Dual-density foam liners designed to address high- and low-speed impacts for more comprehensive energy management. - Structural integrity is bolstered by the shatter-resistant and translucent AURA reinforcing arch that runs throughout the helmet. - Integrated eyewear grippers help secure sunglasses. - All Giro helmets are designed to reduce as much energy as possible while meeting and exceeding stringent safety standards. The goal of Giro's MIPS-equipped helmets is to reduce rotational forces. Giro believes that helmets equipped with this technology can reduce the amount of rotational force that may be transferred to rider's brain in certain impacts. - This visor features an adjustment mechanism that lets you move the visor up and down in indexed steps. These steps include three riding positions plus a high position for goggle storage above your brow. The design allows you to easily adjust your visor with one hand while riding. - Pure silver is the secret ingredient that gives XT2 the power to provide natural, permanent anti-odor protection to keep your helmet feeling and smelling fresh. - The integrated rubber goggle gripper on the back of the helmet helps to ensure that goggles stay in place even when you're getting rowdy on the trail. - The Roc Loc Trail Air Fit System offers micro-adjustable fit adjustment, enhanced ventilation, and durable design that resists abrasion, scratches, and UV rays.

Give credit where credit's due. Thank your mom, your legs, and your gear for giving you the opportunity to land that rocky gap. Made for going big, going fast, or both, the Smith Mainline is our pinnacle, downhill certified enduro bike helmet. Safety innovations like Koroyd and MIPS provide energy-absorbing impact protection so you have the confidence to get aggressive on the trail. It doesn't matter if you're slaying the EWS in Whistler or suffering through the last stage of your local enduro race, you need a breathable, lightweight helmet that pairs well with goggles and fits like a glove. The Mainline integrates with your bike goggles for efficient venting and fog-free vision. Multiple pad sets including liners and neck-rolls let you customize the fit. PROTECTION: Complete Koroyd coverage for lightweight, energy-absorbing and ventilated impact protection, MIPS Brain Protection System reduces rotational forces caused by angled impacts to the head FIT / INTEGRATION: Three washable cheek pad kits, two crown liners and two neck rolls let you fine tune the fit, D-ring chin strap fastener for a snug fit, Designed for ultimate integration with Smith performance goggles for maximum comfort, venting and storage convenience, AirEvac ventilation system integrates with Smith goggles for fog-free lenses FEATURES: 21 fixed vents for consistent airflow, Adjustable visor, Hybrid X-STATIC / Ionic+ anti-bacterial performance lining for odor resistance WEIGHT: (Size M, MIPS) 27oz / 770g CERTIFICATION: CPSC, CE EN 1078, ASTM F1952

There's no reason to skimp on comfort and protection while trying to maintain a budget. The Formula benefits from the same technologies that make Bell's road helmets such champions of comfort and safety. This model features the MIPS impact management as well as Bell's Float Fit retention system and innovative Sweat Guide liner. Elegant shape, fluid aerodynamics and ample ventilation ensure the Formula's place as a classy all-rounder. Specs - MIPS-equipped: MIPS stands for Multi-Directional Impact Protection System, which is a leading slip-plane technology inside the helmet designed to reduce rotational forces that can result from certain impacts. - Construction: Fusion in-mold polycarbonate shell - a process pioneered by Bell bonds the helmet's outer shell to the EPS foam liner to create a sturdier helmet. - Number of vents: 19 - Interior/liner type: Sweat guide pad design pulls moisture away from the brow pad and away from eyewear - Fit system: Float fit - a minimalist, lightweight fit system with an easy-to-turn rubber overmolded dial for adjustments (integrated with MIPS) - Product weight: 285 grams (size M) - Small = 52 – 56cm - Medium = 55 – 59cm - Large/X-Large = 58 – 62cm

Proven MIPS Coverage for Superior Open-Face Performance The Speedframe MIPS Helmet has premium features usually meant for much more expensive helmets. A MIPS liner, goggle compatible 3-position visor, and our 360-degree fit make the Speedframe one of the best values in an open-face helmet. Add in the legendary aggressive Fox design DNA, and you have one of the most shred-ready trail helmets in the market today. Features - Proven MIPS impact protection system reduces rotational forces in a crash - Removable, washable moisture-wicking comfort liner - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3-position adjustable visor - 360 Fit System allows you to dial in your perfect fit every ride - Weight: 360g Sizing - Small = 51 – 55cm - Medium = 55 – 59cm - Large = 59 – 63cm Certifications - CPSC - EN 1078 - AS/NZS 2063

School, park, or neighborhood trails, kids and bikes go places. No matter where their wheels take them, the Smith Zip Jr. bike helmet delivers enhanced angle impact protection with MIPS in a lightweight design that kids want to wear. Our dial-adjustable VaporFit gets the fit right every time. There's a low-profile lining for extra comfort plus plenty of vents to keep the air flowing and kids cool. Just buckle 'em up and start pedaling. PROTECTION: Lightweight in-mold construction, MIPS Brain Protection System reduces rotational forces caused by angled impacts to the head. FIT / INTEGRATION: VaporFit dial adjustment system offers 270-degree fit adjustment with the turn of a dial, Designed for ultimate integration with Smith performance eyewear for maximum comfort, venting and storage convenience, AirEvac ventilation system integrates with Smith goggles and eyewear for fog-free lenses. FEATURES: 21 fixed vents for consistent airflow, Performance comfort lining, Lightweight, low-bulk single layer webbing WEIGHT: (Size XS, MIPS): 8 oz / 240 g CERTIFICATION: CPSC, CE EN 1078, AS/NZS2063

Whether they are enjoying the ride in a trailer, or balancing on their own two wheels, your youngest shredders can ride in style and safety with the Lil Ripper. A compact shell is available in two sizes, with a fit system to dial it in perfectly to your child’s head. The no-pinch side buckle means it can be fit easily and quickly to squirming kids, and the fun graphics mean your child will WANT to wear this helmet. - Universal Child = 48 – 55cm

Fit, Protection, Style Here at TLD, styling, graphics, fit, function and safety are key in everything we create. After years of research and development, the Troy Lee Designs Team introduced the A1 helmet in 2013. We made one of the most comfortable MTB helmets on the market even safer with the addition of MIPS rotational brain protection. This lightweight, fully encapsulated all-mountain helmet utilizes maximum coverage and dimension to keep you safe and protected in all riding conditions. Whether you're charging singletrack, riding dirt jumps or grinding out miles on the XC bike, the A1 helmet offers the premium fit, protection and style you want. "The A1 Classic MIPS Helmet takes top safety honors, earning a perfect 5-star rating in Virginia Techs impact test and was the number one tested mountain bike helmet." - VA Tech Helmet Testing Lab - Featuring MIPS Brain Protection System - a helmet integrated, low friction layer designed to reduce rotational motion transferred to the brain from angled impacts to the head - EPS impact liner maximizes impact protection while minimizing weight Innovative break-away visor screws - 16 port hi-flow cooling system both pulls and pushes air for maximum ventilation - Ultra-plush quick-dry comfort liner is both removable and washable for maximum ventilation - Adjustable, cam-lock strap dividers allow customization for different head shapes and riding styles - CPSC 1203*, CE EN1078*, *Varies by regional standards

Fit, Protection and Style After years of research and development, the Troy Lee Designs Team introduced the A1 mountain bike helmet in 2013. Here at TLD, styling, graphics, fit, function and safety are key in everything we create. This lightweight, fully encapsulated all-mountain helmet utilizes maximum coverage and dimension to keep you safe and protected in all riding conditions. Whether you're charging single track, riding dirt jumps or grinding out miles on the XC bike, the A1 helmet offers the premium fit, protection and style you want. - Reinforced polycarbonate shell in-molded with the EPS liner extends down the sides and back of the head for maximum protection and durability - 8 pressurized intake passages draw in cool air for maximum ventilation - 8 rear vacuum vortex outlets help exhaust and draw heat from head - Triple position adjustable retention system allows customized fit for various eyewear, head shape and riding styles - Single piece, ultra plush, removable and washable comfort liner made of anti-microbial moisture wicking material for a dry, comfortable feel - Full spectrum adjustable moto inspired visor with anodized aluminum hardware - Race inspired styling - Complies with the U.S. CPSC safety standard for bicycle helmet for persons age 5 and older. - Certification - CPSC 1203, CE EN 1078, AS NZ 2063

Bell's Span picks up where the Local left off, offering kids a modern twist on skate and BMX style. The fit is tight and right, and with a dial-adjustable fit system, this thing is staying put, no matter how rad you get. - Construction: ABS hard plastic shell with EPS liner - Number Of Vents: 10 - Fit System: Action Fit - Designed for street and skate helmets, this streamlined fit system offers an adjustable, secure fit with the turn of a dial -Weight: 423 grams (size S)

Featuring a sleek design with extended coverage and an integrated visor, the Spark backs up clean design and its well-ventilated shape with a great fit and the enhanced protection offered with MIPS. Designed for aspiring trail riders, the Spark lets you charge with confidence. - One Size = 50–57cm

The Scamp is packed with amazing features, including some of the same elements found in Giro's best adult helmets, all in a smaller package designed to fit your child. The all new Roc Loc Jr. fit system with pinch-guard buckle provides an easy way to fit your kid’s helmet quickly and securely. With a wide size range, your child can use this helmet as they grow from balance bikes to training wheels. The design is inspired by the adults’ Montaro/ Montara, and since the Scamp is available in a range of kid-friendly colors and designs, your child will be excited to wear it every time they ride.

When every curb is a jump and every patch of dirt screams for a skid, the Tremor is there to keep smiles wide, even when temporary limits are found. Some of the best technologies from Giro's adult line, like In-Mold construction and their acclaimed Roc Loc Sport system, offer the versatility, comfort, and wide adjustability young riders need to ride confidently. And with plenty of fun colors to choose from, there's a perfect option to match the thrill of riding and the feeling of joy after that first ride or lap around the pumptrack. - 50 – 55cm / 19.75 – 21.75 in.

Availability, certification, color, and pricing may vary per region. If outside of the USA, please check with your authorized local dealer for more information.

The Dime is a kid-sized version of the rugged quarter adult helmet, so it has all of the same great features—an eps liner for impact management, a tough outer shell, riveted webbing anchors and plush, sweat-absorbent pads that are easy to swap for dialing in the fit. Another standout feature is the Dime's polyurethane coating, which helps protect the EPS liner from daily wear and tear. Plus, the Dime helmet is available in a bunch of great, kid-friendly colors too, so you're little one can pick out their favorite.

Fit, Protection, Style Here at TLD, styling, graphics, fit, function and safety are key in everything we create. After years of research and development, the Troy Lee Designs Team introduced the A1 helmet in 2013. We made one of the most comfortable MTB helmets on the market even safer with the addition of MIPS rotational brain protection. This lightweight, fully encapsulated all-mountain helmet utilizes maximum coverage and dimension to keep you safe and protected in all riding conditions. Whether you're charging singletrack, riding dirt jumps or grinding out miles on the XC bike, the A1 helmet offers the premium fit, protection and style you want. "The A1 Classic MIPS Helmet takes top safety honors, earning a perfect 5-star rating in Virginia Techs impact test and was the number one tested mountain bike helmet." - VA Tech Helmet Testing Lab - Featuring MIPS Brain Protection System - EPS impact liner - Innovative break-away visor screws - 16 port hi-flow cooling system - Ultra-plush quick-dry comfort liner is both removable and washable

Cooler, Faster in a Protective Package The trailblazing A2 is Troy Lee Designs' MTB trail helmet that checks all the boxes. Its stylish shell not only incorporates huge intake and exhaust ventilation ports, but it also comes with the very best in impact protection. From breakaway visor screws and the innovative MIPS system and an industry-first dual-density EPP + EPS liner that protects against both high- and low-speed impacts; this is a helmet that doesn't take your safety lightly. Add in an adjustable strap and X-Static Pure Silver comfort liner, and the comfort is every bit on par with the protection. Specifications - Huge air intakes - 25% larger than A1 - connected to massive exhaust ports through deep internal channels provide powerful cooling efficiency - MIPS brain protection system reduces rotational forces to the brain in some crash scenarios - Dual-density EPS co-molded with EPP for state-of-the-art impact energy management at low- and high-crash speeds, as well as everything in between - Rear stabilizer fit system with flexible, slimline arms has 3-position front and rear locations for a custom fit - Adjustable strap dividers for a perfect fit every time - 350 grams (size M/L) - CPSC 1203, CE EN 1078, AS NZ 2063:2008

All-Purpose Performer Fitness rides, adventure rides, family rides around the neighborhood...with its easy, approachable style, the Trace is an all-around performer that gives you lots of options. The Ergo Fit system offers a slim, easy-to-use dial, plus No-Twist Tri-Glides provide smooth fit adjustment. Specs - Construction: Fusion in-mold polycarbonate shell - a process pioneered by Bell bonds the helmet's outer shell to the eps foam liner to create a sturdier helmet. - Sport: Cycling - Number of vents: 16 vents - Interior/liner type: Sweat guide pad design pulls moisture away from the brow pad and away from eyewear. - Fit System: Ergo Fit - sleek, easy-to-use dial system for one-handed adjustments (integrated with MIPS layer) - Certification: CPSC bicycle - Sizing: 53 – 60cm, 20.9 – 23.6-inch

Cooler, Faster in a Protective Package The trailblazing A2 is Troy Lee Designs’ MTB trail helmet that checks all the boxes. Its stylish shell not only incorporates huge intake and exhaust ventilation ports, but it also comes with the very best in impact protection. From breakaway visor screws and the innovative MIPS® system and an industry-first dual-density EPP + EPS liner that protects against both high and low-speed impacts; this is a helmet that doesn’t take your safety lightly. Add in an adjustable strap and X-Static® Pure Silver comfort liner and the comfort is every bit on par with the protection. - MIPS (Multi-directional Impact Protection System) - Patent pending, industry-first dual density EPP = EPS impact liner - Innovative break-away visor screws help reduce the likelihood snagging during a crash - Low-profile, semi-adjustable strap dividers - X-Static® Pure Silver comfort liner

We imagined the Sanction 2 to be the go-to full-face helmet for shredders from 5 to 75. This helmet was born rowdy and will never look back. Rowdy by Nature Featuring understated colorways, sleek ID, and a bevy of technical features, Sanction 2 looks, performs, and fits like a much more expensive helmet. During the ground-up design process, our engineering team focused on three core tenets: Fit. Breathability. Value. Fit is amply handled by our new Ventilated DH Air padding. The cheek pads are removable for ease of washing. To address breathability, we spec'd the helmet with 14 vents to prioritize ventilation, regardless of where the helmet is being ridden. We took decades of bike helmet design and race expertise and packed it all into the most affordable full face we've ever made. The result is a bold-looking new helmet perfect for the newer park rider, BMX racer on a budget, or young riders learning to go big. Finally, select colors of the Sanction 2 are available in size XXS to fit the smallest shredders out there and features both ASTM Downhill and BMX certifications. - FLYING BRIDGE VISOR TECHNOLOGY This visor design allows more flexibility and improves airflow across the helmet. By not using a traditional center post and screw concept, we're able to increase the amount of energy management material in a high-impact zone

When your young rider is dedicated to the dirt, you need gear that keeps pace with their skill set. The Smith Wilder Jr. mountain bike helmet combines the enhanced angle impact protection of MIPS with a lightweight, ventilated design just like our adult helmets. 21 fixed vents keep the air flowing as kids bomb down their favorite trails. Our VaporFit dial system adjusts around the head with the turn of a dial to get the right fit every time. There's a built-in visor to cut glare and integrated sunglasses storage, so kids can stow their glasses just like mom or dad. PROTECTION: Lightweight in-mold construction, MIPS Brain Protection System reduces rotational forces caused by angled impacts to the head. FIT / INTEGRATION: VaporFit dial adjustment system offers 270-degree fit adjustment with the turn of a dial, Designed for ultimate integration with Smith performance eyewear and goggles for maximum comfort, venting and storage convenience, AirEvac ventilation system integrates with Smith goggles and eyewear for fog-free lenses FEATURES: 20 fixed vents for consistent airflow, Integrated visor, Performance comfort lining, Lightweight, low-bulk single-layer webbing WEIGHT: (Size XS, MIPS): 10 oz / 270 g CERTIFICATION: CPSC, CE EN 1078

Aggressive styling in our most affordable DH certified helmet. - Lightweight injection molded ABS shell - Inspired by our podium proven Rampage Pro Carbon - Injected Mesh vent screens maintain superior ventilation and airflow while providing protection from dirt and debris - Double D-Ring closure - Adjustable Visor - PC, ABS, PA, EPS, Polyester

The Scamp MIPS is packed with amazing features, including some of the same elements found in Giro's best adult helmets, all in a smaller package designed to fit your child. The Roc Loc Jr. fit system with pinch-guard buckle provides an easy way to fit your kid’s helmet quickly and securely. The wide size range ensures children can use this helmet as they grow from balance bikes to training wheels. The design is inspired by the adult Montaro MIPS / Montara MIPS, and since the Scamp MIPS is available in a range of kid-friendly colors and designs, children will be excited to wear it every time they ride. Scamp MIPS models are available with the Multi-Directional Impact Protection System. MIPS can redirect energy and provide more protection in certain impacts.

Big Kid Style The Scamp II is Giro's smallest helmet designed for young (or future) riders but it still goes big with features and style. Taking design cues from adult helmets like Manifest Spherical, this lightweight in-mold helmet features impact-dissipating EPS foam with a sturdy polycarbonate shell, plus 13 vents for efficient cooling power. The Roc Loc® Junior fit system provides extra adjustability with a simple-to-use dial for several years of head protection for fast-growing rippers. The XS is designed for riders aged 1 and older while the Small is for riders aged 5 and older. Whether they're rolling along in a trailer or powering the pedals themselves, Scamp II is going to make kids want more bike time. FEATURES - IN-MOLD CONSTRUCTION — In-Mold Construction fuses a tough polycarbonate outer shell with the helmet's impact-absorbing foam liner. The fusion process allows for better ventilation systems, making in-mold helmets lighter and cooler than traditional helmets. - ROC LOC® JR. FIT SYSTEM — Roc Loc® Jr. is a simple, durable, dial fit system specifically shaped to match the curvature of a child's head. The shape was developed with years of research into anatomic data to ensure a secure, comfortable fit. A large, rubberized knob makes it easy for adults to adjust the helmet for proper tension, allowing kids to quickly start their ride. HIGHLIGHTS XS: Complies with the US CPSC Safety Standard for Bicycle Helmets for Persons Age 1 and Older (Extended Head Coverage) S: Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older

Aggressive styling in our most affordable DH certified helmet Our Rampage Helmet features a lightweight injection-molded ABS shell inspired by our iconic Rampage Pro Carbon Helmet. Large vents provide superior airflow for all-day comfort. The fully adjustable visor and quick release buckle add big-mountain function to this full face MTB helmet. - Proven MIPS™ impact protection system reduces rotational forces in a crash - Lightweight, injection molded ABS shell - Inspired by our podium-proven Rampage Pro Carbon - Mesh vent screens provide ventilation while filtering dirt and debris - D Ring closure - Adjustable visor - CERTIFICATIONS - CPSC - EN 1078AS/NZS 2063 - ASTM 1952-15 downhill - ASTM 2032-15 BMX

TLD's Stage helmet: less weight, more fun! Since its debut, the Stage helmet has redefined mountain bike safety, style, comfort and ventilation. Stage is the lightest full-face helmet in its class, and combines MIPS (Multi-directional Impact Protection System), EPP (for slow speed impacts) and EPS (for high-speed impacts) in one sleek package, that sets the standard for mountain bike enduro helmets. A Polylite shell w/fiber reinforcement and Polyacrilite injected chin bar w/EXOskeleton adds strength without sacrificing weight. 11 high-flow air intakes and 14 exhaust ports and large ventilation chin bar openings aid in cooling and comfort in all conditions. The TLD Stage Helmet also includes an X-Static® helmet liner that is moisture-wicking, quick-drying and odor-fighting. A Fidlock® buckle and lightweight hardware round out the overall package. - DUAL DENSITY EPS co-molded with EPP - MIPS brain protection system - EPP lined chinbar - 690 grams (1.5 lbs) size M/L - Meets Certification for CPSC 1203, CE EN1078, ASTM F1952, ASTM F2032, and AS/NZS 2063 *Varies by regional standards

Fit, Protection and Style After years of research and development, the Troy Lee Designs Team introduced the A1 mountain bike helmet in 2013. Here at TLD, styling, graphics, fit, function and safety are key in everything we create. This lightweight, fully encapsulated all-mountain helmet utilizes maximum coverage and dimension to keep you safe and protected in all riding conditions. Whether you're charging single track, riding dirt jumps or grinding out miles on the XC bike, the A1 helmet offers the premium fit, protection and style you want. - Reinforced polycarbonate shell in-molded with the EPS liner extends down the sides and back of the head for maximum protection and durability - 8 pressurized intake passages draw in cool air for maximum ventilation - 8 rear vacuum vortex outlets help exhaust and draw heat from head - Triple position adjustable retention system allows customized fit for various eyewear, head shape and riding styles - Single piece, ultra plush, removable and washable comfort liner made of anti-microbial moisture wicking material for a dry, comfortable feel - Full spectrum adjustable moto inspired visor with anodized aluminum hardware - Race inspired styling - Complies with the U.S. CPSC safety standard for bicycle helmet for persons age 5 and older. - Certification - CPSC 1203, CE EN 1078, AS NZ 2063

Fitness rides, adventure rides, family rides around the neighborhood. With its quality in-mold Polycarbonate Shell construction and easy, approachable style, the new Traverse is an all-around performer that gives you lots of options. This model offers the addition of MIPS (Multi-Directional Impact Protection System), which can provide an additional measure of protection in certain impacts. The one-size-fits-all ErgoDial Fit System allows for one-handed adjustment- just press a button and turn the dial, simple as that. Totally comfortable, totally cool. - One Size: 54-61cm - X-Large: 56-63cm