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The SM3 is Alpinestars' off-road motorcycle helmet for motocross, enduro and trail riding. It uses a thermo-injected shell with varying thickness, a multi-density EPS liner sized to each shell, and a patented rotational impact system that cuts rotational force to the head. A visor release system sheds the peak on impact to reduce neck load, and 10 inlets plus seven exhaust ports move air hard. It is DOT and ECE certified and comes in several shell sizes. Riders rate it highly for comfort and venting; the main trade-offs are wind noise and the peak catching air at highway speed, which is normal for a dirt helmet.
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Lowest price we've seen: $229.00 on Nov 13 at Amazon. Tracked across 1 store since Nov 13.
Owners rate the SM3 highly, praising the light feel, the airflow and the secure fit. Complaints center on wind noise and the visor pulling at higher speeds.
The Alpinestars SM3 is an off-road helmet made for motocross, enduro and other off-road riding. It is designed around ease of use, comfort and impact protection, and it meets both DOT and ECE 22.06 standards.
The shell is thermo-injected from a special polymer blend, with varying thickness to balance impact protection and low weight. Inside, a multi-density EPS liner is made of 5 parts in 4 densities. A patented low-friction coating on the liner reduces rotational acceleration forces from oblique impacts. The chin area was tested to a tougher in-house standard than the homologation requires, and its shell thickness and structure were optimized to pass.
The helmet has 10 inlets and seven exhaust ports for airflow. Hydration tube channels are built into the cheek pads. The patented visor release lets go at a set force to reduce load on the rider's neck in an impact. The crown and cheek pads are available as spare parts in different thicknesses to adjust the fit.
