Features D3O high performance foam and an open-back construction so no shoe removal is necessary. - D3O high performance shock absorbing foam on the front and foam padded sidewalls for additional coverage - Perforated Neoprene enhances venting and moisture control; terry lined for wicking and comfort - Integrated stabilization pad centers the knee and ensures a secure fit - Branded rubber grab tabs and RF moniker logo - Open back construction; no shoe removal necessary