Alpinestars - SM5 Action 2 HelmetBlack/White/Bright Red Glossy product view, lightweight off‑road motorcycle helmet with ventilation and impact protection

Black/Yellow Fluo/Bright Red Glossy product view, lightweight off‑road motorcycle helmet with ventilation and impact protection

Bright Red/Blue Glossy product view, lightweight off‑road motorcycle helmet with ventilation and impact protection

Black/White/Bright Red Glossy product view, lightweight off‑road motorcycle helmet with ventilation and impact protection

product view, lightweight off‑road motorcycle helmet with ventilation and impact protection

Alpinestars - SM5 Action 2 Helmet

Name: Alpinestars - SM5 Action 2 Helmet
Brand: Alpinestars
SKU: 482-9224S
Price: 354.95 USD
Availability: OutOfStock

$354.95

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Alpinestars - SM5 Action 2 Helmet

The SM5 Action 2 Helmet is built for riders who want a modern off-road helmet with serious protection and a clean, aggressive look.

The SM5 helmet has been designed to provide MX riders with a helmet that is safe and purposefully designed to deliver optimal protection and comfort. The lightweight SM5 helmet features a thermo-injected shell incorporating a special polymer blend enhanced by varying degrees of thickness that is engineered to deliver the optimal combination of impact protection and light weight, while the five density EPS liner ensures the correct density in the correct area for enhanced impact absorption.

Why We Like It

We like this helmet because it feels secure without being overly heavy, and the venting actually works when you’re charging hard.

Why It’ll Work for You

If you’re after a helmet that can handle moto days, off-road loops, and everything in between, this one gives you dependable protection and comfort.

Variants / Options

Available in multiple shell sizes and graphics so you can get a confident fit and a look that matches your style.

Key Features

With a strong outer shell, advanced impact liner, and plenty of venting, it works to manage energy in a crash while keeping air moving around your head.
Alpinestars quality construction designed for real-world off-road and motocross use.

Alpinestars - SM5 Action 2 Helmet

Selection

Black/White/Bright Red Glossy / SM

About Alpinestars

Founded in 1963, Alpinestars is a global leader in motocross gear and motorcycle protective equipment. Known for innovation, their Tech 10 boots, riding jerseys, pants, and gloves combine performance, comfort, and safety. From pro racers to everyday riders, Alpinestars sets the standard browse Alpinestars motocross gear at BTO Sports.

About Leatt

Leatt revolutionized rider safety with the invention of the neck brace in 2001. A leader in motocross protective gear, Leatt designs helmets, body armor, chest protectors, knee braces, and off-road riding apparel built to safeguard riders without sacrificing performance or comfort. Shop Leatt motocross gear at BTO Sports.

About Fox Racing

Since 1974, Fox Racing has been a powerhouse in motocross, defining the sport's style and performance. From the iconic V3 helmet to 360 and Flexair race gear, jerseys, pants, gloves, and MTB apparel, Fox blends innovation, durability, and bold design. Shop Fox Racing motocross gear at BTO Sports.

About Bell Helmets

With a heritage dating back to 1954, Bell Helmets is synonymous with safety, performance, and trust. Pioneers in helmet technology, Bell engineers full-face motocross helmets, dirt bike helmets, and MIPS-equipped lids built through rigorous testing. Shop Bell motocross helmets at BTO Sports.

About Troy Lee Designs

Founded in 1981, Troy Lee Designs brings artistic flair and race-driven innovation to motocross gear. Known for custom-painted SE5 and SE Pro helmets, GP race jerseys, pants, and gloves, TLD delivers vibrant style and elite protection. Shop Troy Lee Designs motocross gear at BTO Sports.

About Seven MX

Co-founded by motocross legend James Stewart, Seven MX redefines riding gear with cutting-edge materials and a modern athletic fit. Their Rival and Annex race jerseys, pants, and gloves deliver style, mobility, and protection. Shop Seven MX motocross gear at BTO Sports.

About Fly Racing

A motocross staple since 1998, Fly Racing offers high-quality riding gear for beginners to pros. Their Kinetic and F-16 race jerseys, pants, gloves, Formula helmets, and protective gear deliver durability, comfort, and affordability. Shop Fly Racing motocross gear at BTO Sports.

About Thor

Pioneering motocross gear since 1968, Thor MX is one of the most trusted names in racing. Their Pulse and Sector race jerseys, pants, gloves, and Reflex helmets deliver durability and protection. Shop Thor motocross gear at BTO Sports.

About Oakley

Oakley is an iconic brand fusing technology and style with premium eyewear for motocross riders. Known for high-performance Prizm lenses, the Airbrake and Front Line MX goggles deliver superior optics, clarity, and protection in any conditions. Shop Oakley motocross goggles at BTO Sports.

About 100%

A symbol of motocross performance and innovation, 100% delivers high-quality goggles, eyewear, and riding gear. The Racecraft, Accuri, and Strata MX goggles enhance visibility and comfort on the track and trail. Shop 100% motocross goggles at BTO Sports.

About Fasthouse

Fasthouse captures the spirit of motocross culture with retro-inspired designs and modern functionality. Born from the SoCal dirt bike scene, their Grindhouse race jerseys, pants, gloves, and casual MX apparel deliver heritage style and performance. Shop Fasthouse motocross gear at BTO Sports.

About O'Neal

One of the original names in motocross, O'Neal has over 50 years of innovation in riding gear. Their Element and Hardwear race jerseys, pants, helmets, and boots deliver maximum protection, comfort, and style on the track or trail. Shop O'Neal motocross gear at BTO Sports.

About 6D Helmets

6D Helmets has redefined motocross head protection with their innovative Omni-Directional Suspension (ODS) technology. Engineered to reduce rotational force impact, the ATR-2 and ATR-1 and ATR-3 dirt bike helmets keep riders at the forefront of safety. Shop 6D motocross helmets at BTO Sports.

About Shoei

Founded in Japan in 1959, Shoei has earned a reputation for crafting premium motorcycle helmets. Combining hand-made craftsmanship with cutting-edge technology, the RF-1400 and X-Fifteen full-face helmets deliver superior fit, comfort, and safety for serious riders. Shop Shoei motorcycle helmets at BTO Sports.

About Asterisk

Asterisk leads the industry in motocross knee brace technology, offering riders unmatched support and protection. Backed by biomechanical research, the Cell and Ultra Cell knee braces help prevent ACL and MCL injuries, giving riders confidence to push their limits. Shop Asterisk knee braces at BTO Sports.

About Moose Racing

Moose Racing has been a trusted name in off-road gear and accessories since 1986. Known for durable, high-quality products, Moose Racing outfits riders for every off-road adventure, from protective gear to performance parts that stand up to the toughest terrains.

About FMF

Since 1973, FMF has been at the forefront of performance exhaust systems. Handcrafted in the USA, FMF’s exhausts are designed to boost power and performance while withstanding the rigors of motocross and off-road riding, making them a go-to choice for enthusiasts and pros alike.

About Pod MX

Pod MX specializes in advanced knee braces designed to protect and stabilize the knees of motocross riders. Engineered for maximum support, their braces are trusted by top athletes to prevent injuries and aid recovery, ensuring riders stay in the game longer.

About Gaerne

With over 50 years of experience, Gaerne is an Italian brand renowned for its handcrafted boots. Known for superior comfort, durability, and protection, Gaerne boots are a top choice for motocross riders who demand the best in footwear for their off-road adventures.

About EVS

EVS Sports has been protecting riders for over 30 years with its innovative line of protective gear. From knee braces to body armor, EVS is dedicated to injury prevention, offering riders cutting-edge technology and peace of mind on the track and trail.

About Dunlop

Dunlop is a leading name in motorcycle tires, known for its precision and performance on all terrains. Whether you’re racing motocross or cruising on the road, Dunlop tires offer the grip, stability, and durability riders trust to perform at the highest levels.

About KLIM

KLIM is a leader in premium adventure and off-road gear, offering riders high-performance apparel designed for extreme conditions. Known for their durability, technical fabrics, and innovative design, KLIM outfits those who push the boundaries of exploration and endurance.

About Sidi

Sidi is an Italian brand that has been crafting high-performance motocross boots for over 50 years. Renowned for their fit, protection, and durability, Sidi boots are worn by champions and everyday riders who demand the highest level of performance and comfort.

About Factory Effex

Factory Effex is the go-to brand for custom graphics, seat covers, and accessories that let riders personalize their bikes. With a focus on quality and creativity, Factory Effex helps riders express their unique style while enhancing bike performance and durability.

About HJC

HJC has been producing high-quality helmets for motorcyclists since 1971. Combining advanced technology with affordability, HJC offers a wide range of helmets that deliver superior comfort, fit, and protection, making them a popular choice for riders worldwide

About Acerbis

Since 1973, Acerbis has been a leader in aftermarket plastics and protective gear. Known for their durability and innovation, Acerbis provides riders with essential parts and gear designed to enhance performance and stand up to the toughest off-road conditions.

About Mobius

Mobius is known for creating advanced orthopedic knee braces designed to offer superior protection without sacrificing comfort. Their revolutionary technology provides stabilization and support, helping motocross riders prevent injury and stay on the track longer.

About Pro Circuit

Founded by racing legend Mitch Payton in 1978, Pro Circuit has become synonymous with high-performance exhaust systems and tuning parts. Designed for serious racers, their products are engineered to maximize power and reliability, making them a favorite on the podium.

About Shift MX

Shift MX, founded in 1997, is a bold, fashion-forward brand that delivers high-performance motocross gear. With a focus on innovation and style, Shift creates lightweight, durable products that offer protection and freedom of movement, helping riders express their individuality.

About Arai

Arai helmets are hand-built in Japan with a legacy of uncompromising safety and craftsmanship. Known for their fit, comfort, and advanced protection features, Arai helmets are a premium choice for riders who prioritize safety without sacrificing performance or style.

About Yoshimura

Yoshimura has been a leader in high-performance exhaust systems since 1954. Known for precision craftsmanship and race-proven engineering, Yoshimura exhausts are trusted by top riders for delivering unmatched power, performance, and reliability on the track and street.

About ODI

ODI Grips has been making high-quality grips and handlebars for over 25 years. Their patented Lock-On grip system revolutionized the industry, offering riders unparalleled comfort, control, and easy installation, making ODI a favorite among motocross and off-road enthusiasts.

About USWE

USWE specializes in creating bounce-free hydration packs that keep riders hydrated without compromising performance. Built for motocross and off-road adventures, USWE packs feature an innovative harness system, ensuring a comfortable, snug fit during the most intense rides.

About Flo Motorsports

Flo Motorsports is renowned for their high-performance motorcycle parts, including footpegs, levers, and handlebars. Engineered with precision and durability in mind, Flo products are designed to enhance control and comfort, helping riders perform at their peak on any terrain.

About OGIO

OGIO is the go-to brand for premium gear bags, backpacks, and luggage. Known for their durability and functional design, OGIO products are built to withstand the rigors of motocross travel, keeping your gear organized and protected whether you’re heading to the track or trail.

About Just1

Just1 Helmets is an Italian brand focused on crafting lightweight, high-performance helmets with superior protection. Their helmets blend cutting-edge design with advanced safety technology, making them a top choice for motocross riders seeking comfort and security on every ride.

About Motion Pro

Motion Pro has been providing innovative tools and controls to the motorsports industry since 1984. Known for their high-quality cables, levers, and specialty tools, Motion Pro products are trusted by professionals and DIY mechanics alike for repairs and upgrades.

About Renthal

Renthal is a global leader in handlebars, grips, and chainwheels for motocross and off-road bikes. Founded in 1969, Renthal’s commitment to innovation and quality has made them the brand of choice for top racers and riders who demand precision and durability.

About Scott

Scott Sports is an industry leader in motocross goggles and apparel, known for innovation and high-performance products. Their goggles are trusted by riders for superior optics, protection, and comfort, ensuring clear vision and reliability in the harshest conditions.

About LS2

LS2 Helmets offers an affordable range of high-quality helmets for motocross and street riders. Combining advanced safety features, lightweight materials, and modern designs, LS2 helmets deliver protection and comfort without compromising on performance or style.

About Maxima

Maxima Racing Oils has been manufacturing high-performance lubricants and chemicals for motorcycles since 1979. Known for their precision-engineered products, Maxima is trusted by top racers and everyday riders to keep their bikes running smoothly and efficiently.

About Ride Engineering

Ride Engineering specializes in high-performance motorcycle components, including triple clamps, brake calipers, and suspension accessories. Their products are designed to enhance handling and performance, giving riders a competitive edge on the track.

About Risk Racing

Risk Racing develops innovative products for motocross riders, offering everything from tool kits and bike stands to lighting systems. Their focus on practical solutions helps riders and mechanics simplify tasks and improve performance both on and off the track.

About Twin Air

Since 1972, Twin Air has been the leader in high-performance air filters for off-road and motocross bikes. Known for their durability and superior filtration, Twin Air products protect engines from harsh dirt and debris, ensuring optimal performance in any conditions.

About Forma

Forma Boots is an Italian brand known for their high-quality motocross and adventure riding boots. Combining comfort, protection, and advanced design, Forma boots are crafted to withstand the toughest rides while providing riders with excellent support and durability.

About DCor Visuals

DCor Visuals is a top provider of custom graphics, decals, and seat covers for motocross bikes. Their premium designs allow riders to personalize their bikes with durable, high-quality products that not only look great but can also withstand the rigors of off-road racing.

About Mika Metals

Mika Metals produces top-tier handlebars, chains, and sprockets designed for strength and performance. Engineered with high-quality materials, their products are trusted by pro riders and motocross enthusiasts to provide durability and control in the most demanding environments.

About Galfer

Galfer Brakes has been a leader in high-performance braking systems since 1952. Known for their wave rotors and brake pads, Galfer delivers exceptional stopping power and heat dissipation, making their products essential for motocross riders seeking ultimate control and safety.

About Cardo System

Cardo Systems is a pioneer in wireless communication for motorcyclists. Their advanced Bluetooth systems allow riders to connect with fellow riders, listen to music, and receive navigation instructions, all while keeping hands on the handlebars and eyes on the road.

About Michelin

Michelin is a world-renowned tire manufacturer known for their high-performance motorcycle tires. Offering excellent grip, durability, and handling, Michelin tires are designed to meet the demands of motocross and road riders, ensuring superior performance in all conditions.

Alpinestars Helmet Size Chart (Adult)

Size	Head Circumference (cm)	Head Circumference (in)
XS	53-54	20.8-21.2"
S	55-56	21.6-22"
M	57-58	22.4-22.8"
L	59-60	23.2-23.6"
XL	61-62	24-24.4"
2XL	63-64	24.8-25.2"

Head Circumference: Using a measuring tape, measure the head circumference at the head's widest point, just above the eyebrows and the ears.

Alpinestars - SM5 Action 2 Helmet

Alpinestars - SM5 Action 2 Helmet

Why We Like It

Why It’ll Work for You

Variants / Options

Key Features

Alpinestars Helmet Size Chart (Adult)

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