Train Hard. Hit Harder The new KO Boxing Shoe from Nike. UPPER: Lightweight & durable foam mesh with abrasion resistance on the toe. MIDSOLE: The midsole is constructed of strong lightweight materials to maximize speed and stability in the ring. SOLE: A solid punch starts with solid footwear so NIKE improved the shoe’s feel for the floor and traction with re-engineered gum rubber soles that are thinner and more sticky.