Incrediwear® Calf Sleeve is made of a therapeutic fabric that dramatically increases blood flow to help reduce pain, swelling and stiffness. Ideal for leg cramps, muscle strains, shin splints and more. Comfortable and breathable, the sleeve can be worn day or night. 63% Polyester (Carbon Infused);27% Nylon; 10% Lycra Spandex. Machine wash and dry.