This is a LARA★STAR elbow sleeve with adjustable straps. The size is L, please refer to the size chart in the third photo. It's a beautiful item, only used once at the gym after being purchased new. While it offers more rebound and protection than SBD or P.L. college sleeves, the fabric is stiff and difficult to move in, making it hard to handle at my level, so I'm selling it. My upper arm is 37cm and the L size fit perfectly. The ability to adjust the tightness with the straps was a good feature.