I have two knee sleeves with minimal use - $25 for both sleeves. The Ortho Active stabilizing Knee sleeve is an economical Coolprene sleeve with two spiral stays medially and laterally and a patella hole which relieves pressure on the patella. The compression sleeve and side stays provide knee stability and the perforated Coolprene material keeps the knee cool during activity. Size XL FITS 17 to 18 inch knee circumference (Measure around your knee to get accurate size). Retail cost $65.00 (I have receipt still). Worn a couple of times but found that my knees are beyond this method of help!!!!