NIKE Womens Power Speed Running Tights 74% Polyester/26% Spandex Low-profile waistband and drawcord for a secure, comfortable fit Reflective details enhance visibility in low light Fabric: Body: Dri-FIT 74% polyester/26% spandex. Pocket: 100% polyester. Gusset lining: Dri-FIT 100% recycled polyester. Machine wash Compression fit provides a high level of support across key muscles, for exceptional mobility.