Alpinestars SM3 Heat Helmet — L, Red gloss

SM3 Heat Helmet engineered for MX, Enduro and off‑road riding, balancing ease of use, comfort and impact performance.

The thermo‑injected shell uses a special polymer blend with variable thickness to deliver impact protection with low weight.

An Alpinestars patented low‑friction coating is applied to the inner EPS liner to reduce rotational acceleration from oblique impacts.

This low‑friction layer acts as a slip plane to mimic cerebrospinal fluid, the brain's natural defense against oblique impacts.

The patented visor release system ensures the visor releases at a predetermined force, reducing neck forces during an impact.

Maximized ventilation and heat transfer come from 10 inlets and 7 exhaust ports for consistent airflow.

Shell composition: 48% acrylonitrile‑butadiene‑styrene, 20% polyurethane, 16% polystyrene (EPS), 6% polypropylene, 4% polyvinyl chloride, 2% ethylene‑vinyl acetate, 2% steel, 1% expanded polypropylene, 1% polyamide.