Cramer Performance Muscle Compression Shorts 10% spandex Anatomical design with elastic cross band supports the core and enhances muscle performance Compression fit improves blood circulation Light-weight fabrication promotes endurance and mobility Performance Shorts are for athletes who want enhanced core support and muscle performance while training Body fabricated from 78% Nylon/22% Spandex, Elastic constructed with 90% polyester, 10% spandex, available in black and white, please see sizing chart image for proper fit