Mueller Knee Support One Size Fits Most Pull-On / Hook and Loop Strap Closure 12 to 51 cm Left or - EachAbout Mueller Knee Support, One Size Fits Most (1 Unit) Will work for either knee Neoprene blend provides even compression and soothing warmth Anatomically shaped patella opening Four way external adjustment system for better compression Secondary straps allow for concentrated compression Thin straps help prevent bunching of material behind the knees Patented design helps sore, weak, injured and arthritic knees Description: Knee Support One Size Fits