Alpinestars SMX-S Boots Borrowing heavily from the SMX-6, yet lighter on their feet, the SMX-S Boots are a stripped down street version of the perennially popular sport boot. Retained are the replaceable TPU sliders and the race-derived TPU shin plate, but eighty-sixed are the bio-mechanical ankle apparatus in favor of more comfortable TPR— making the SMX-S ideal for street riders seeking simplicity and all-day wearability.  Features: Durable microfiber upper construction offering superb levels of flexibility and comfort Ergonomic last for forefoot streamlining to enable greater control 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 ankle protectors are layered under the upper in both lateral and medial sides Breathable textile interior lining features anti-sliding suede reinforcement on heel area Integrated, replaceable bi-injected TPU slider features easy no-screw fixing concept Shift pad made from TPU incorporates technical texture for protection and grip Medial side entry opening and closing system features elastic-mounted zipper with wide VELCRO® brand closure Internal toe box protection is layered under the upper for durability, improved feel and performance Dual compound removable anatomic footbed includes EVA and Lycra Compound rubber sole CE certified