IMPACTO Hinged Hard Shell Fire Retardant Kneepads. High density wing style molded foam padding. Padding is covered with 100% cotton durable flame resistant fabric. Made of toxin free foam. Breathable Coolmax® inner lining. Adjustable straps with hook and loop closure. Helps prevent knee stress. Provides protection from sparks. Made with 100% PVC-Free materials for a clean environment.