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. Features Durable microfiber upper construction offering superb levels of flexibility and comfort Ergonomic new last for forefoot streamlining to enable greater precision on the bike’s controls and for superior, wide-ranging foot profile, fit and comfort New, ergonomically optimized TPU shin plate protector is racederived for superior impact and abrasion resistance Lateral TPR-injected ankle support construction offers optimized levels of protection and stability TPU double density ankles protectors are layered under the upper in both lateral and medial side for excellent all-round levels of protection Breathable textile interior lining features anti-sliding suede reinforcement on heel area Integrated, replaceable bi-injected TPU slider features new easy noscrew fixing concept for quicker and easier replacement Shift pad made from TPU incorporates technical texturing for protection and grip Medial side entry opening/closure system features elastic-mounted zipper with wide velcro closure for flexibility and secure fit. The aperture opening is large to promote easier entry/exit Internal toe box protection is layered under the upper for durability, improved feel and performance New, dual compound removable anatomic footbed includes EVA and Lycra for performance, comfort and support Alpinestars’ new and exclusive compound rubber sole promotes improved feel and grip, water dispersion and durability SMX-S Boot is certified