The Schiek Model 1136ES Elbow Sleeve supports the elbow and is made with Breath O Prene which is a breathable neoprene product, Breath O Prene is washable and expels moisture, Made with pride in the USA, For sizing measure around your flexed bicep, 15in and below is a medium; 15in - 17in is large; and 17in - 20in is x-large, SKU: JRSPORTS2727