SIZE: XXS: thigh circumference 12-14 joint circumference 8-11 ankle circumference 4-6 leg height 13 XS: thigh circumference 17-20, joint circumference 11-13, foot mouth circumference 7-10, leg height 16 S: thigh circumference 22-25, joint circumference 13-16, foot mouth circumference 10-14, leg height 20 M: Thigh girth 29-32 joint girth 17-20 foot girth 13-16 leg height 25 L: thigh circumference 36-39, joint circumference 22-25, foot mouth circumference 16-19, leg height 30 Material: Neoprene With Metal Strip Inserts to Stabilize Canine Leg Wrist Carpal Joints. With reflective straps provide visibility and gives you peace of mind in walking your dog in the dark. PAIN RELIEF: reduces pain caused by cruciate ligament injuries, osteoarthritis and kneecap problems by increasing the joint's temperature helping to reduce the inflammation. FAST RECOVERY: optimal joint temperature increases blood circulation, improves Oxygene delivery, increases performance for a faster recovery. VETERINARIAN PREMIUM QUALITY: our knee brace is designed and manufactured to provide superior support and comfort without compromising the dog's mobility. The High Performance Neoprene offers enhanced elasticity for a better adaptation to the dog leg. Some dogs have a fallen hip and the upper belt may slide back and fall off.