Reebok Mens Crossfit Nano Speed, Cherry/White, 12 D Synthetic-and-mesh DuraCage with PU casting: Provides stablity throughout the midfoot Full CRTEK outsole: Offers durability and traction Sublite 48c Foam: Gives the foot a soft responsive feel and cushion CRTEK mid-foot wrap and DuraGrip toe protection: Provides protection from the mid-foot to the toe Closed cell Synthetic: Provides durability and resistance to abrasion ETC Linings: Anti-Friction: Reduces heat build up