Made from our signature stretch loop terry fabric, this casual layer offers technical performance with a stylishly relaxed fit. The Birdie boasts four-way stretch and moisture-wicking properties and is finished with a ribbed collar and an integrated whistle stop.� Features: 89% polyester / 11% spandex. Four-way stretch, moisture-wicking, quick-dry and easy-care. UPF 50+ sun protection. Machine wash cold with like colors; Tumble dry low. Do not iron. Do not dry clean.