Our 4-Way Adjustable Knee Support provides compression to help sore, weak, injured and arthritic knees with the internal and external adjustment system for a comfortable fit. The thin straps help prevent bunching of material behind the knee. Perforated neoprene blend provides even compression, soothing warmth, and ventilation. Anatomically shaped patella opening and half tube buttress support helps keep the kneecap in place.