Nike KO Boxing Shoe - Unlimited - TRAIN HARD. HIT HARDER - The Unlimited Colorway evokes the limitless potential of athletes in motion, with a spectrum of high-intensity hues and energetic patterns designed to defy description and elude competition. UPPER: Lightweight and durable foam mesh upper with abrasion resistance on the toe. MIDSOLE: The midsole is constructed with strong light weight materials to maximize speed and stability in the ring. OUTSOLE: A sold punch starts with solid footwear. Because of this, we improved the shoe's feel for the floor and traction with reengineered gum rubber soles that are thinner and more sticky.