YF-36 Protective Compression Antislip Knee Short Sleeve With Honeycomb Crash Proof Pad - 1 Piece polyester Material:83% Polyester and 17% Spandex, high quality soft and elastic fabric With honeycomb compression pad design to protect leg and knee against impact, as well with anti slip band, no easy to fall off Knee Support also features technology to retain heat and increase blood flow and oxygen to soft tissue injuries to aid recovery and help prevent further injury The fabric is bibulous and good breathable, protect the leg and knee from pulling during in outdoor activities such as running, basketball, football, cycling Available in 3 sizes (see Product description or images for a size guide)