4-way stretch fabric with silpure antimicrobial helps prevent blisters while controlling odor * Eva forefoot pad provides superior cushioning and energy return for people on their feet all day * Spencore material a 5/32 inch 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-strike pad provides extra cushioning and shock absorption in the heel