The Bamboo Charcoal Carpal Tunnel Wrist Support is great for natural relief of achy muscles and joints. They are made with activated bamboo charcoal that provides unique, self-warming technology. Unlike normal supports, it activates with your body heat to bring restorative warmth to your muscles, cartilage, and joints. Natural heat can increase blood circulation, which in turn delivers proteins, nutrients, and oxygen to the affected area. This helps improve your range of motion, enhance muscle performance, and aids in recovery. And if you overheat, bamboo charcoal can fluctuate in temperature to provide cooling relief. The Bamboo Charcoal Carpal Tunnel Wrist Support is safe, effective, and easy to use. It can be worn all day and night for long-lasting relief. Try it today and you’ll discover why they’re the most comfortable, self-warming supports ever created. Bamboo Charcoal > Natural Heat, which Improves: Blood Circulation Muscle Relief Joint Problems due to Aging Tension & Soreness Inflammation After Workouts Mobility & Flexibility Physical Activity Aids in Recovery Size Circumference: X-Small: 6" - 7" Small: 6.5" - 7.5" Medium: 7.5" - 8.5" Large: 8" - 10" How to Measure: Measure the circumference of your big knuckles on your hand.