Boy's Nike Pro Hyperstrong Core Short Fabric: Body: Dri-FIT 90% polyester/10% spandex. Mesh: Dri-FIT 94% polyester/6% spandex. Overlay: 93% nylon/7% spandex. Pad top fabric: 82% polyester/18% spandex. Pad: 75% polyethylene/25% ethylene. P Nike Pro Hyperstrong technology delivers impact absorption. Foam pads are strategically placed for protection. Compressive fit for a locked-in feel. Elastic waistband provides a secure, snug fit. Flat seams help minimize irritation caused by chafing.