NIKE Boys' Youth Therma Sphere Training Hoodie Black Size M, L 100% polyester 100% polyester. Machine washable. Nike Therma-Sphere fabric offers lightweight warmth. Sphere Training Hoodie, a slim-fitting pullover made with heat-trapping fabric. Multi-panel hood provides comfortable coverage Raglan sleeves allow natural range of motion Graphic print at front. Zippered pockets provide secure storage.