NIKE Structured Training Belt 2.0, Size Small, Black/Total Crimson Content: 30% Polypropylene, 25% Polyester, 25% EVA, 20% nylon Nylon.Steel roller buckle keeps belt securely in place Firm nylon keeps plastic inserts at lower back maximize support Anatomically correct design encourages proper lifting technique Perforated back panel with ventilation channels regulates temperature Content: 30% Polypropylene, 25% Polyester, 25% EVA, 20% Nylon