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. This product is made with at least 75% recycled polyester fibres. Dri-FIT technology helps keep you dry and comfortable. A wide elastic waistband lies flat against your skin to hold the shorts in place. More details - tight fit for a body-hugging feel. 83% Polyester, 17% Elastane.