The Vulkan Neoprene Long Wrist Support is a pull on design and fits either left or right wrist. Covers wrist and palm of hand. Ideal for those recovering from a recent wrist injury or sprain who have residual discomfort and/or weakness or those suffering from arthritis. Measure circumference of the middle of the wrist with arm extended. Sizes Available: XS (11-13cm), Sml (13-16cm), Med (16-19cm), Lge (19-22cm), XL (22-25cm