CW-X Men&#39;s Insulator Stabilyx Tights, Black/Grey/Red, X-Large 80% Polyester/20% Polyurethane Imported The support web provides knee and hip joint support Warm stretch" temperature Regulation fabric provides comfortable running for fall/winter conditions Wind-proof, water-repellent front panel adds comfort in wind and rain YKK flip lock zippers and reflective front logo 80% Nylon/ 20% Lycra Provides Targeted Support to the knee and core joints and muscles 100% Warmstretch Body Fabric Helps to keep the body warm and dry, pulls moisture away from the body and carries it to the outside of the tight