"Phiten's Metax Pelvis Belt is lightweight and breathable for the ultimate comfort. The level of strength can be easily adjusted with the attached auxiliary support belt keeping the pelvis in place to help prevent strains and distortions.The material is thin allowing the pelvis belt to be worn on the outer layer without distraction. Material: Body - Nylon 68% / Polyurethane 32% Support Belt - Nylon 68% / Polyurethane 32% Velcro Fastener - Polyester 100% Technology:Metax"