Copper Fit PLUS: Knee Compression Sleeve with Zipper In EXTENDED SIZES 86% polyester, 14% spandex Imported Zipper and adjustable strap - easy to put on and take off Compression provides support for muscles and joints. Helps relieve muscle stiffness, soreness and pain. Copper ions, bound to the fibers, help reduce garment odors. Measure the circumference of your thigh, approximately 5" above the center of your knee. Sizing: XL (19"-21"), XXL (21.5 -23"), XXXL (23.5 "-25"). UNISEX design. KNEE SLEEVE SIZING: To get the correct fit for you, please measure the circumference of your thigh, approximately 5 above the center of your knee. You may need to adjust the brace a few inches up or down to the get desired compression and comfort.