Gore Bike Wear Women's Mythos Thermo Shirt, Neon Yellow/Black, X-Large 88% Nylon, 12% Elastane, Insert: 85% Nylon, 15% Elastane, Mesh: 100% Polyester Imported Winter essential: a warm running shirt made of push-pull material. Wear under a jacket in extremely cold weather, or wear alone in moderately cold conditions. Slim fit Close fit collar Flat-lock seams Partial mesh inserts for better ventilation Short zip with semi-lock slider and underflap Sleeve hem with thumbhole