NIKE Power Speed Tight Fabric: Body: Dri-FIT 74% polyester/26% spandex. Pocket: 100% polyester. Gusset lining: Dri-FIT 100% recycled polyester Machine Wash Nike Power fabric provides stretch and support. Screen-printed graphic provides engineered support. Zippered pocket with a vapor barrier keeps small items dry and secure. Drawcord is encased in a low-profile waistband for a comfortable, personalized fit. Utilizes an innovative graphic inspired by the lane lines on a track. It is strategically applied along the IT band and across key muscles for support and a compressive feel while running.