Springboost Men's B-Volley Volleyball Shoe 100% Leather Rubber sole DorsiFlextion Technology U control insole Program with two interchangeable insoles Energy Plate: TPU piece improving the roll of the foot and providing for optimal player positioning Cross upper design providing mid-foot and forefoot support and Dual Density in forefoot providing extra shock absorption Designed specifically for volleyball and court players to improve their jump height by 4%-6%