STRETCHY SUPPORT.The Nike Pro Shorts are a super-duper stretchy, supportive layer that can be worn alone, or under your shorts or uniform.Add in Dri-FIT technology and sweat has no chance.Dri-FIT technology helps keep you dry and comfortable.A wide elastic waistband lies flat against your skin to hold the shorts in place.Composition:83% Polyester 17% Spandex. Compare prices from: Nike in Children's Sportswear