Alpinestars Supertech M10 Fame MIPS® Helmet
Features The S-M10's design offers a smooth, attractive, aerodynamic profile which is streamlined and free of any external channels and features that might act as a load point in an... Read More
Features
- The S-M10's design offers a smooth, attractive, aerodynamic profile which is streamlined and free of any external channels and features that might act as a load point in an impact or compromise the overall integrity of the helmet's construction
- Surface curvature promotes reduced friction on impact, allowing deflection and transfer of energy to protect the rider's head from direct force to the skull and referred to the neck and spinal column
- The S-M10 shell sizing solution ensures each helmet fit size has its own appropriate shell size to deliver the most anatomical solution for the wide variety of fit needs, thus ensuring riders have the correct fit to improve comfort, reduce overall weight, and improve effectiveness of the helmet in an impact
- Chin bar's base area specifically sculpted to give a relief section and raised to clear the collarbone
- Soft EPS liner extends beyond the helmet shell itself and is covered by a flexible rubber compound providing a reduced chance of any sort of collarbone injury
- A-Head Fitment System allows easy adjustment of the angle and height that the helmet sits on the head
- Ultra-ventilated helmet with 28 individual intake and exhaust ports, not including the eye port, with 18 intakes and 10 exhausts
- Eject technology includes the eject helmet removal system
- Rotational acceleration and oblique impact performance
- Removable side pads, made from a semi-soft polymer for added protection, provide contact area to help spread impact energy
- Emergency Release System (ERS) Emergency Visor Release and Visor Extension provides protection
How to measure
Using a measuring tape, measure the head circumference at the head's widest point, just above the eyebrows and the ears. Fine-tuning: the same cheek pads fit all helmet sizes — choose thickness 35 or 40 (optional parts) for a tighter fit. The crown pad varies by helmet size (shared within XS/S and XL/2XL).
Alpinestars size chart
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| 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 |
Youth sizes
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| YS | 48-49 | 18.9-19.3 |
| YM | 50-51 | 19.6-20 |
| YL | 52-53 | 20.4-20.8 |
One effective adult chart covers the whole current line: Alpinestars publishes separate street (Supertech R10) and off-road (Supertech M10/S-M10, SM7, SM3) size-guide assets, but the circumference values are numerically identical. Inch values are MANUFACTURER-PRINTED decimals, not our conversions. Label normalized: charts print the largest size as XXL but Alpinestars' own variant pickers use 2XL. Adult range is XS-2XL only (no 3XL+); youth range is YS-YL only (no YXL — the only youth helmet is the SM3 Youth). Discontinued/nonexistent models as of Jul 2026: Supertech M8, M5, SM5 (discontinued), SM8 (never existed) — current MX lineup is Supertech M10, SM7, SM3, SM3 Youth. SR10 shell mapping: shell S=XS+S, M=M, L=L, XL=XL+2XL. Verified on US + Canadian storefronts (identical CDN chart images); EU not independently verified. Verified from alpinestars.com official size-guide images 2026-07-14.
Manufacturer sizing data · verified July 14, 2026