SMX-6 v2 Boots - Black/Red - US 9 / EU 43 SMX-6 v2 Boots Boot uppers incorporate an innovative front and rear bellows and rear calf zones for superior levels of flexibility Boot uppers are constructed from microfiber for durability and abrasion resistance Ergonomic forefoot streamlining enables greater control of the bike's controls and provides a superior, wide-ranging foot profile for excellent fit and comfort Thermoplastic Polyurethane (TPU) lateral ankle braces provide a biomechanical support between the lateral top calf/shin and ankle and provides improved structural integrity, protection against impact shocks, repeated abrasion resistance and flex support Air vents on the heel counters and shin plates plus breathable mesh inserts improve comfort and reduce fatigue on the ride (vented boot styles only) High modulus TPU-injected shin guards, calf protectors, heel counters, shift pads, ankle braces and toe sliders for improved shock protection and durability Double-density ankle protectors on the medial side, layered under the uppers, offer protective performance in key areas Integrated, replaceable bi-injected TPU sliders feature a new easy-screw fixing concept for quicker, easier replacement Innovative insteps and Achilles accordion flex zones construction for superior comfort, extension, control and support Internal insoles with shake reinforcement integrated for support to the arch area and foot protection Medial side entry opening/closure system features elastic-mounted zipper with wide hook-and-loop closure for flexibility and a secure fit Aperture openings are large to promote easy in/out of the boots Internal toe box protection is layered under the upper for durability, improved feel and performance Breathable textile interior lining features anti-sliding suede reinforcement on the heel area to help keep the foot in position while riding New, removable anatomic footbeds include EVA and stretch fabric Rubber compound soles promote improved feel and grip, water dispersion and durability Drystar® version has Alpinestars waterproof, breathable liners, which provides excellent all-weather performance