OTC Great Products. Title : Champion/OTC Knee Stabilizer, Hinged Bars, Neoprene, Blue, (XXX-Large 19.5-21″). This is for one Champion/OTC Knee Stabilizer, Hinged Bars, Neoprene, Blue. Other Shoes and Boots Coats and Jackets Back Braces Wrist Braces Knee Braces Compression Hosiery Socks Camping Gear Misc.