Craft Sportswear Women's Active Extreme Crewneck Long Sleeve Base Layer Wicking Shirt: cooling/sport/bike/ski/run/sun/protection/top 100% Polyester Imported Elastic jersey with ergonomic fit and excellent body-temperature management Ergonomic fit and superb drying effect A hexa-channel fiber against the skin enhances moisture transport, which cools the body down Flatlock seams that follow body movements