The Nike Flex Essential 2-in-1 shorts have a tight, stretchy base layer underneath a loose, woven outer layer. They give you plenty of flexibility and have sweat-wicking technology to keep you dry and comfortable. Flexible Outer Layer The woven outer shorts are made with Bike Flex fabric that stretches with your body, helping you get the most out of your performance - without getting in your way. Body Hugging Beneath The sweat-wicking, stretchy inner shorts help keep you feeling dry, supported and covered as you move. Body: 88% polyester / 12% spandex Tight: 82% polyester / 18% spandex Gusset lunging: 100% polyester