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Product Highlights & Commentary

Expert Engineering Analysis

Engineered for off‑road dominance, the SM3 full‑face helmet delivers a purpose‑built architecture that tackles the toughest trail conditions. AlpineStars has integrated a monocoque shell that wraps the rider’s head in a seamless protective envelope, while the reinforced chin bar and integrated visor maintain a low‑profile silhouette essential for aggressive motocross and enduro riding. The design’s rigidity and weight distribution are tuned specifically for off‑road disciplines, giving you confidence whether you’re carving tight berms or tackling high‑speed desert sections.

Designed for all‑day comfort, the SM3’s interior system balances airflow and cushioning to keep riders cool and relaxed. A multi‑layer liner with moisture‑wicking padding conforms to the head shape, while strategically placed vent ports and an adjustable exhaust channel create a steady stream of fresh air across the forehead and cheeks. The removable cheek pads and interior liners are easy to clean, ensuring the helmet stays fresh on long‑haul rides and in variable climates.

Built to meet the toughest impact criteria, the SM3 adheres to industry‑standard safety benchmarks for off‑road helmets. Its impact‑absorbing core is engineered to dissipate energy efficiently, reducing rotational forces during a crash. In real‑world testing, the helmet has proven its resilience on rugged terrain, delivering the level of protection riders expect from a premium full‑face design without compromising performance or comfort.

Product Classification

Offroad MX HelmetHELMETS > Off-Road / MX Helmets > Offroad MX Helmet

Unit / Package Weight

4.8951 lbs (2.22 kg)

Dimensions (L x W x H)

15.94" x 10.82" x 13.32"

UPS Dimensional Weight

17 lbs (Billable: 17 lbs)

Discipline & Application

Offroad (2026)

Manufacturer Spotlight:Alpinestars(Est. 1963, Asolo, Italy)

One Goal. One Vision. World-class technical racing apparel and safety protection.

Alpinestars

ALPINESTARS SM3 Radium Helmet

MPN: 8300826-3216-S|DPN1: 482-00275S|DPN3: 01109806|SKU: 1083008263216S|EAN: 8054866137600|MMW: 0279950279950195973000|Fitment: Not Available

$279.95

Available

RIDER SIZING SPECIFICATION | Human Body & Headform Sizing

Helmets and apparel are sized to human body measurements. View the Official Sizing Guide below.

Select Color: RED MOLTEN/RED FLUO/WHITE

Select Size: Small

Proceed to Checkout

Free US ShippingOrders over $150

30-Day ExchangesHassle-free size swap

Manufacturer WarrantyNot Available

Alpinestars Technical Performance & Engineering

Key engineered features, technical highlights, and manufacturer specifications

Authentic Specifications

Safety & Protection (4)

OEM Technical Standards

The design’s rigidity and weight distribution are tuned specifically for off‑road disciplines, giving you confidence whether you’re carving tight berms or tackling high‑speed desert sections.
Designed for all‑day comfort, the SM3’s interior system balances airflow and cushioning to keep riders cool and relaxed.: A multi‑layer liner with moisture‑wicking padding conforms to the head shape, while strategically placed vent ports and an adjustable exhaust channel create a steady stream of fresh air across the forehead and cheeks.
Built to meet the toughest impact criteria, the SM3 adheres to industry‑standard safety benchmarks for off‑road helmets.: Its impact‑absorbing core is engineered to dissipate energy efficiently, reducing rotational forces during a crash.
In real‑world testing, the helmet has proven its resilience on rugged terrain, delivering the level of protection riders expect from a premium full‑face design without compromising performance or comfort.

Materials & Construction (1)

OEM Technical Standards

Engineered for off‑road dominance, the SM3 full‑face helmet delivers a purpose‑built architecture that tackles the toughest trail conditions.: AlpineStars has integrated a monocoque shell that wraps the rider’s head in a seamless protective envelope, while the reinforced chin bar and integrated visor maintain a low‑profile silhouette essential for aggressive motocross and enduro riding.

Comfort & Climate Control (1)

OEM Technical Standards

The removable cheek pads and interior liners are easy to clean, ensuring the helmet stays fresh on long‑haul rides and in variable climates.

Additional Features & Specifications (4)

OEM Technical Standards

The SM3 Helmet is designed to set new standards in performance, safety, and comfort for off-road enthusiasts
Packed with cutting-edge technology and engineering innovations, it ensures an unparalleled riding experience
With the SM3 helmet, you can experience the perfect combination of safety, comfort, and performance
Ride confidently wherever the trail takes you

End of Product Information

Complete Your Setup

Frequently Paired Accessories & Tools

ALPINESTARS

ALPINESTARS Supertech S-R10 Optical Grade Road Racing Face Shields

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ALPINESTARS Optically Superior Anti-Scratch Face Shield

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ALPINESTARS Supertech S-M7 / S-M8 / S-M10 Motocross Visors

ALPINESTARS

ALPINESTARS VISOR SQUAD23 BN/GD

ALPINESTARS

ALPINESTARS VISOR DYTNA23 G/O/P

ALPINESTARS

ALPINESTARS Supertech S-M10 Ampress Yl/Blk XXL

ALPINESTARS

ALPINESTARS HT-5 & HT-7 Heat Tech Wireless Heated Gloves

ALPINESTARS

ALPINESTARS GP Tech Leather Racing Gloves

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Factory Technical Reference

Verified Workshop Blueprints & Maintenance Specs

Explore All 122 Verified Workshop Platforms →

Servicing your machine? Cross-reference factory torque values, fluid capacities, chain pitches, and tire pressures directly from certified workshop service manuals before installation.

Harley-Davidson · 2017–2024

Road Glide / Street Glide M8

Milwaukee-Eight 107/114/117ci

4.0 qt 20W-50 | Formula+ Primary | 80W-140 Trans

Yamaha · 2020–2025

Ténéré 700 (T7)

689cc CP2 Crossplane Twin

2.6 L 10W-40 | 525 Chain | 90/90-21 & 150/70R18

Honda · 2020–2025

CRF1100L Africa Twin

1084cc Unicam Parallel Twin

4.0L Manual / 4.2L DCT | SILMAR8A9S Iridium

Kawasaki · 2019–2025

Ninja ZX-6R (636)

636cc DOHC Inline-Four

3.6 L 10W-40 | 520 Chain (112L) | 127 N·m Axle

Polaris · 2019–2025

RZR XP 1000 / XP 4

999cc ProStar DOHC Twin

2.5 qt PS-4 5W-50 | AGL Trans | Demand Drive

Can-Am · 2018–2025

Maverick X3 Turbo / Turbo R

Rotax ACE 900cc Turbocharged

3.5 L 0W-40 | QRS-X CVT | 75W-140 Gearbox

Polaris · 2018–2025

General 1000 / XP 1000

999cc ProStar 100 HP Twin

2.5 qt PS-4 5W-50 | 122 N·m Lug | AGL Gearcase

Can-Am · 2020–2025

Defender HD10 / MAX

Rotax 976cc V-Twin 82 HP

2.2 L 5W-40 | 100 N·m Lug | PRO-TORQ CVT

Verified Technical Reference

Frequently Asked Questions

Consult the authentic option and part number matrix under the Technical Specifications and Fitment tab. You can match the authentic OEM Manufacturer Part Number (MPN) or ride model specifications to confirm exact compatibility.

Photo 1 of 31 | Click to Enlarge

Product Highlights & Commentary

Expert Engineering Analysis

Product Classification

Offroad MX HelmetHELMETS > Off-Road / MX Helmets > Offroad MX Helmet

Unit / Package Weight

4.8951 lbs (2.22 kg)

Dimensions (L x W x H)

15.94" x 10.82" x 13.32"

UPS Dimensional Weight

17 lbs (Billable: 17 lbs)

Discipline & Application

Offroad (2026)

Manufacturer Spotlight:Alpinestars(Est. 1963, Asolo, Italy)

One Goal. One Vision. World-class technical racing apparel and safety protection.

Alpinestars

ALPINESTARS SM3 Radium Helmet

MPN: 8300826-3216-S|DPN1: 482-00275S|DPN3: 01109806|SKU: 1083008263216S|EAN: 8054866137600|MMW: 0279950279950195973000|Fitment: Not Available

$279.95

Available

RIDER SIZING SPECIFICATION | Human Body & Headform Sizing

Helmets and apparel are sized to human body measurements. View the Official Sizing Guide below.

Select Color: RED MOLTEN/RED FLUO/WHITE

Select Size: Small

Proceed to Checkout

Free US ShippingOrders over $150

30-Day ExchangesHassle-free size swap

Manufacturer WarrantyNot Available

Alpinestars Technical Performance & Engineering

Key engineered features, technical highlights, and manufacturer specifications

Authentic Specifications

Safety & Protection (4)

OEM Technical Standards

The design’s rigidity and weight distribution are tuned specifically for off‑road disciplines, giving you confidence whether you’re carving tight berms or tackling high‑speed desert sections.
Designed for all‑day comfort, the SM3’s interior system balances airflow and cushioning to keep riders cool and relaxed.: A multi‑layer liner with moisture‑wicking padding conforms to the head shape, while strategically placed vent ports and an adjustable exhaust channel create a steady stream of fresh air across the forehead and cheeks.
Built to meet the toughest impact criteria, the SM3 adheres to industry‑standard safety benchmarks for off‑road helmets.: Its impact‑absorbing core is engineered to dissipate energy efficiently, reducing rotational forces during a crash.
In real‑world testing, the helmet has proven its resilience on rugged terrain, delivering the level of protection riders expect from a premium full‑face design without compromising performance or comfort.

Materials & Construction (1)

OEM Technical Standards

Engineered for off‑road dominance, the SM3 full‑face helmet delivers a purpose‑built architecture that tackles the toughest trail conditions.: AlpineStars has integrated a monocoque shell that wraps the rider’s head in a seamless protective envelope, while the reinforced chin bar and integrated visor maintain a low‑profile silhouette essential for aggressive motocross and enduro riding.

Comfort & Climate Control (1)

OEM Technical Standards

The removable cheek pads and interior liners are easy to clean, ensuring the helmet stays fresh on long‑haul rides and in variable climates.

Additional Features & Specifications (4)

OEM Technical Standards

The SM3 Helmet is designed to set new standards in performance, safety, and comfort for off-road enthusiasts
Packed with cutting-edge technology and engineering innovations, it ensures an unparalleled riding experience
With the SM3 helmet, you can experience the perfect combination of safety, comfort, and performance
Ride confidently wherever the trail takes you

End of Product Information

Complete Your Setup

Frequently Paired Accessories & Tools

ALPINESTARS

MPN	8300826-3216-S
DPN1	482-00275S
DPN3	01109806
SKU	1083008263216S
EAN	8054866137600
MMW	0279950279950195973000
Selected Option / Variant	S-M3 RADIUM HELMET ECE06/DOT RED MOT/RED FL/WHT GL SM
Package Shipping Weight	4.8951 lbs
Shipping Box Dimensions	15.94" L x 10.82" W x 13.32" H
Shipping Box Length (Depth)	15.94 in
Shipping Box Width	10.82 in
Shipping Box Height	13.32 in
UPS Dimensional Weight	17 lbs (Volumetric)
UPS Billable Shipping Weight	17 lbs (Volumetric / Dimensional)
Freight Classification Code	SFR
Shipping Box Count	1 Individual Carton
Origin	Not Available
Wps L1	Helmets & Accessories
Warranty Coverage	Not Available

MPN	8300826-3216-S
DPN1	482-00275S
DPN3	01109806
SKU	1083008263216S
EAN	8054866137600
MMW	0279950279950195973000
Selected Option / Variant	S-M3 RADIUM HELMET ECE06/DOT RED MOT/RED FL/WHT GL SM
Package Shipping Weight	4.8951 lbs
Shipping Box Dimensions	15.94" L x 10.82" W x 13.32" H
Shipping Box Length (Depth)	15.94 in
Shipping Box Width	10.82 in
Shipping Box Height	13.32 in
UPS Dimensional Weight	17 lbs (Volumetric)
UPS Billable Shipping Weight	17 lbs (Volumetric / Dimensional)
Freight Classification Code	SFR
Shipping Box Count	1 Individual Carton
Origin	Not Available
Wps L1	Helmets & Accessories
Warranty Coverage	Not Available