Craft Sportswear Women's Cool Mesh Superlight Sleeveless Skiing Cycling Base Layer Shirt: sport/bike/ski/run/sun/protection/shirt 95% Polyester, 5% Elastane Imported Excellent moisture transport Ergonomic fit for total freedom of movement Lightweight micro polyester with a 6-channel fiber construction that effectively pulls away perspiration vapor to keep you cool Mesh with big-hole constuction for super ventilation and cooling Soft and comfortable fit