Xtreme "00" Copper Compression Recovery Sleeve is a registered product with 88% copper/12% Nylon infused fabric for Knee, Elbow, Ankle and Calf Recovery. Provides an "Xtreme" comfortable/ gentle recovery to sore,aching muscles and joints.A soft and contoured fit with gentle compression to targeted areas. Highest content of Copper Infused Fabric available of any Copper Compression Sleeves on the market today. Compare the content of our products with others and see the difference Xtreme"00" makes, XXL