ProFlex® 500 Tennis Elbow Support relieves the stress caused by repetitive motion. Nylon-laminated neoprene sleeve directs pressure away from tendons of the forearm muscles. Lightweight fabric conforms to the forearm. Can be worn over clothes or next to the skin. Cinch strap with hook and loop closure can be adjusted easily for a secure, custom fit. May be worn on the left or right forearm. To size, measure forearm circumference. Medium 10in to 11in (25 to 28cm).