Nike Workout Gear. PERFORMANCE COMFORT The Nike Pro Big Kids' (Boys') Training Shorts are combine sweat-wicking fabric and mesh panels to help keep you dry and ventilated during practice and competition. Benefits Dri-FIT Technology helps keep you dry and comfortable Compression fit for support and comfort Strategically placed mesh offers excellent breathability Ergonomic seams for enhanced range of motion Flat seams move smoothly against your skin Elastic waist for a snug, comfortable fit Product Details Fabric: Body: Dri-FIT 90% polyester/10% spandex. Mesh: Dri-FIT 92% polyester/8% spandex. Machine wash Imported Style: 726461; Color: Carbon Heather/Black/Black; Size: XS; Gender: Boys; Age Group: Kids Great for Soccer ; Track & Field ; Basketball ; Running.