DetailsCW-X Sleeves Size Chart The new CW-X Speed Model line was developed to support athletes muscles and joints during long high intensity workouts. It’s CW-X's lightest weight fabric and yet provides firm compression using Japanese high performance fabric Flex Move® and Viscomagic™ technology. Flex Move™ is a circular stretch knit created and developed using unique technology that offers an unrivalled stretch factor of 300% with total recovery in record time. Viscomagic™ technology transforms a polyester/ nylon base into a fabric with varying compression and control zones. The Unisex CW-X Speed Model Calf Sleeve features our patented support panel to map your lower leg muscles to provide support and stability during any workout.