Upper is constructed from microfiber. Ergonomic last for forefoot streamlining and for superior, wide-ranging foot profile, fit, and comfort. Alpinestars TPU lateral ankle brace protection provides a bio-mechanical support between lateral top calf/shin and ankle. Air vents on the heel counter and shin plate, plus breathable mesh inserts, improve comfort and reduce fatigue on short and long rides. TPU injected shin guard, calf protector, heel counter, shift pad, ankle brace, and toe slider. Product features match those of SMX-6 v2 Vented Boots above. Double density ankle protector on medial side. Innovative instep and Achilles accordion flex zone construction. Internal insole with integrated reinforcement. Removable anatomic footbed includes EVA and Lycra. Alpinestars new and exclusive compound rubber sole promotes improved feel and grip, water dispersion and durability. CE-certified.