The Nike Crew delivers lightweight warmth in a classic silhouette. Sweat-wicking capabilities help you stay dry while Therma fabric helps you stay warm from the first pitch to the last out. Dri-FIT technology helps you stay dry, comfortable and focused. Nike Therma fabric helps you stay warm on cold game-days. A hidden kangaroo pocket helps keep small items close and your hands warm. Curved hem extends coverage. 100% polyester.