Streamlined baselayer features H2x-dry - Fabric that wicks moisture away from the skin, helping regulate optimum body temperature during high exertion activities. This 1/4-zip contours the body, while contrast seam and zip makes you stand out of the crowd.Washing Instructions Machine wash cold. Tumble dry low. Do not iron. - Streamlined baselayer features H2x-dry - Fabric that wicks moisture away from the skin, helping regulate optimum body temperature during high exertion activities. This 1/4-zip contours the body, while contrast seam and zip makes you stand out of the crowd.Washing Instructions Machine wash cold. Tumble dry low. Do not iron.