With a durable microfiber upper for comfort and fit and incorporating a host of advanced protective features, inside and out, the SMX-S Boot features an ergonomic forefoot shaping, a breathable lining and Alpinestars’ exclusive rubber compound sole for optimized levels of support and performance. Innovative air vents at the ankle, heel and forefoot are covered with a specially designed mesh to provide unmatched levels of rider comfort. Large ‘throat’ profile instep and Achilles flex bellows for superior flex and comfort. MTP mesh liner and anatomical, removable, PU Foam foot bed keeps the foot cool and comfortable. Innovative inner (medial) side entry opening/closure system that features an elastic mounted zipper with an extra wide Velcro flap, to give a precise, comfortable fit and wide opening aperture for ease of access. Highly ergonomic last for ultra precise fit.