Jr Mercurial Victory IV CR IC Synthetic A lightweight performance boot, built for the junior player for use on court surfaces. UPPER: Soft, supple syntehtic upper for great ball feel. MIDSOLE: Innovative Nike Jr. Support sockliner does mirror the natural junior athlete's foot shape and provides great support and low-profile cushioning. OUTSOLE: Molded rubber. Innovative Vapor traction pattern designed especially for speed on indoor surfaces.