The CopperFit(R) Elite Shoulder Compression Sleeve helps reduce muscle and joint stress and swelling. This high performance knit material is infused with copper to create a compression fit. This adjustable sleeve features a seamless design and moisture wicking materials for maximum fit and comfort. Details Copper infused high performance knit material Compression fit for muscle and joint performance Seamless knit helps prevent chafing Wicks moisture and reduces odor Size: S/M 13" - 17", L/XL 17" - 20" Fits left or right shoulder