XK443-X8X246 Top running shoes with the futuristic new Nitro technology injected in the wavy midsole providing extreme cusioning and speed.The super light knit fabric ensures freshness and speed of drying, while reflevtive details guarantee high visibility.Composition:Main Upper Shoe:100% Polyester.Secondary Upper Shoe:100% Thermoplastic Polyurethane.Tongue:100% Polyester.Secondary Tongue:100% Polyamide.Secondary Tongue Coating:100% Polyurethane.Lining:100% Polyester.Insole:100% Polyester.Sole:100% Rubber.Midsole:100% Ethylene-Vinyl Acetate.