Alpinestars SMX S Boots Features Durable microfiber upper construction offering superb levels of flexibility and comfort Ergonomic new last for forefoot streamlining to enable greater control of the bike's New TPU shin plate protector is race-derived 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 Breathable textile interior lining features ant sliding suede reinforcement on heel area Integrated, replaceable bi-injected TPU slider features new easy no-screw fixing concept Shift pad made from TPU incorporates technical texturing for protection and grip Medial side entry opening/closure system features elastic mounted zipper with wide Hook and Loop closure 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 Alpinestars new and exclusive compound rubber sole CE certified