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The Alpinestars Youth SM3 is a motocross and off-road helmet built for younger riders. Its thermo-injected shell uses varying polymer thickness to balance impact protection and low weight, and the EPS liner has a low-friction coating meant to reduce rotational forces in oblique impacts. Ventilation is generous, with ten inlets and seven exhaust ports fed by the visor. Crown and cheek pads come in different thicknesses as spare parts, so the fit can be tuned as a child grows. It sits in the same class as other youth off-road helmets, but the slip-plane liner and adjustable padding are features many rivals at this level leave out.
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The Alpinestars Youth SM3 is a youth-size MX helmet in solid matte black. Its thermo-injected shell is made from a polymer blend with varying thickness, and the outer shell is an impact-resistant thermoplastic. The multiple-density inner liner puts the right density in each area for impact absorption and helps keep weight down.
The inner and outer surfaces are engineered to minimize the effects of oblique impacts. A low-friction coating on the inside of the main EPS liner acts as a slip plane to reduce rotational acceleration forces. The visor release system lets go with a pre-determined amount of force to reduce the load on the rider's neck during an impact.
Ten inlets and seven exhaust ports provide ventilation, and the visor directs air into the ports. The crown and cheek pads can be swapped for spare pads of different thicknesses to tailor the fit. The cheek pads have hydration tube channels and can be removed with the helmet on using the Emergency Release System.
