Alpinestars 2017 SMX-6 V2 Boots - Vented Black Red WhitePN : 34041152puFeatures Normal 0 false false false EN-US X-NONE X-NONE Newlydesigned boot upper incorporates innovative front, rear bellow and rear calfzones for superior levels of flexibility. The upper is constructed from microfiberfor durability and abrasion resistance.Ergonomiclast for forefoot streamlining to enable greater control of the bike’s controlsand for superior, wide-ranging foot profile, fit and comfort.Alpinestars’innovative TPU lateral ankle brace protection provides a biomechanical supportbetween lateral top calf/shin and ankle and offers improved structuralintegrity, protection against impact shocks, repeated abrasion resistance andflex support.Airvents on the heel counter and shin plate plus breathable mesh inserts (ventedversion only) improve comfort and reduce fatigue on short and long rides.Highmodulus TPU injected shin guard, calf protector, heel counter, shift pad, anklebrace and toe slider for improved shock protection and durability.Doubledensity ankle protector on medial side layered under the upper offersprotective performance in key area.Integrated,replaceable bi-injected TPU slider features new easy screw fixing concept forquicker and easier replacement.Innovativeinstep and Achilles accordion flex zone construction for superior comfort,extension, control and support.Internalinsole with the shank reinforcement integrated for support to the arch area andfoot protection.Medialside entry opening/closure system features elasticmounted zipper with widevelcro closure for flexibility and secure fit. The aperture opening is larg