Nike tech tightarticulated comfort zoned ventilationthe nike tech running tights feature mesh panels behind the knee and ergonomic seams for strategic breathability and wide range of motion on your run features material main body 92 polyester 8 spandex back knee panels 80 polyester 20 spandex gusset lining 100 recycled polyester dri fit fabric to wick away sweat and help keep you dry and comfortable articulated knees and flat seams for natural range of motion and minimal irritation