This Alpinestars S-M3 review considers a motocross helmet with a thermo-injected polymer shell, emergency-release cheek pads and hydration-tube channels. The Jettson, Force, Heat, Radium, Solid, Falcon and Yamaha editions share the checked core specification, so they are treated as one model.
This is a specification-based buying guide, not a hands-on road test. We may earn a commission from purchases through our links, at no extra cost to you.
Off-road fit and hydration routing
The three-shell specification and double-D fastening provide the starting point for a fitting. Check even pad contact and secure retention before adjusting your goggles. Channels through the cheek pads accommodate a hydration tube; confirm the routing and compatibility with the drinking system you actually use.
Ten air inlets and seven exhaust ports are listed, alongside a liner using recycled material and a low-friction inner EPS surface. These are design details rather than a measured result for your own riding. Read the emergency cheek-pad removal instructions and check the correct replacement pads for the S-M3 rather than another Alpinestars model.
Protection and construction
The listed approval is ECE 22.06. Check the exact helmet label and specification for the version you are buying, particularly if you need it for a track event.
Fit and adjustment
The chin-strap fastening is Double-D. Make sure you are comfortable operating that fastening and adjusting it securely before choosing the helmet.
Comfort and everyday use
The interior is removable for cleaning. Follow the manufacturer’s care instructions and refit the pads in their original positions.
See our motorcycle helmet reviews for more buying guides.
Related reading: Alpinestars S-M5 Review.