4-way stretch fabric with silpure antimicrobial helps prevent blisters while controlling odor. * Eva forefoot cushion provides superior cushioning and energy return for high impact sports. * Spencore? material a 5/32? layer of this material absorbs shock and impact to provide intense comfort and cushioning. * Lightweight polysorb? polyurethane foam provides arch and heel support. * Spencore? heel plug provides extra cushioning and shock absorption in the heel.