NIKE Pro Youth Boys Hyperwarm HBR Compression Tights Nike Pro Hyperwarm HBR Compression Boys' Tights are made with stretchy Dri-FIT fabric with flat seams, creating a smooth, locked-in fit with zero distractions. Flat stretch waistband offers a snug fit that stays in place. Flat seams move smoothly against your skin for comfort. Dri-FIT fabric helps keep you dry and comfortable.100% polyester