M: Thigh circumference 29-31cm, joint circumference 17-20cm, foot circumference 13-16cm, leg length 25cm.L: Thigh circumference 32-36cm, joint circumference 22-25cm, foot circumference 16-19cm, leg length 30cm.360 SUPPORT: Light compression guarantees stability and improves balance between muscle groups for full support and prevents injuries from developing into more serious conditions.PAIN RELIEF: Reduces pain caused by cruciate ligament injuries, osteoarthritis and kneecap problems by increasing the temperature of the joint helping to reduce inflammation.FAST RECOVERY: Optimal joint temperature increases blood circulation, improves oxygen delivery, increases performance for faster recovery.VETERINARIAN PREMIUM QUALITY: Our knee brace is designed and manufactured to provide superior support and comfort without compromising the dog's mobility. High performance neoprene provides increased elasticity for better adaptation to the dog's paw. Some dogs have a dropped hip and the top belt may slip back and fall off.