Nike Pro Combat Boys Compression Shorts The Nike Pro Hypercool Compression Boys Shorts are made with stretchy Dri-FIT fabric for a locked-in feel to help support muscles during competition. Ventilation in key areas delivers breathability where you need it most. Dri-FIT fabric helps keep you dry and comfortable. Compression fit for a locked-in feel. Mesh panels at sides, front, back and inside leg for excellent breathability. Durable elastic waist for a snug, comfortable fit Flat seams to help minimise irritation due to chafing. Ergonomic seams for natural range of motion. Fabric: Body: Dri-FIT 92% polyester/8% elastane. Side panels: Dri-FIT 100% polyester.