Metaframe technology with synthetic composite boot Rocketframe NHL-caliber lightweight composite material Speedcore 2 stiffness making it more lightweight and rigid HD microfiber liner with durazone abrasion protection Smooth contour soft pad around collar of the boot for excellent foot and ankle comfort Multi density memory foam for customized fit and comfort Concave reinforced TPU outsole with exhaust system 7mm felt tongue with embossed lace-bite protection Anatomical response footbed Speedblade 4.0 holder with speedblade stainless steel runner