FEATURES: Molded to a pre-curved ergonomic fit, impact-absorbing SmartFlex(TM) pads offer form-fitting and lightweight protection. Engineered internal shell for flexible protection that will hold the shape over time and increase protection from impact Compact wrap-around coverage for superior elbow and upper arm protection. Foam layer for increased comfort. Sleeveless construction provides quick on/off. Elevated materials featured inside and out, with cushioned mesh lining. Machine washable. Moisture-wicking, UPF 50+ compression fabric keeps wearer dry and comfortable Durable fabric cover ADDITIONAL DETAILS: S/M Size: 11.5" - 13.5". Measure bicep around widest point L/XL Size: 13.5" - 16". Measure bicep around widest point Official Protective Equipment Supplier of Major League Baseball