Made of neoprene to provide heat therapy Aluminum stay can immobilize the thumb in the position. Elastic loop straps wrap the wrist to give firmly fit and support. The inner foam padding give thumb more comfort and cushion. Universal for both hands Ideal for after post-operative thumb, thumb sprain, inflammation of tendon, and arthritis. It was made of neoprene to provide heat therapy to accelerate the blood circulation. The aluminum stay can be bended for proper fit to immobilize the thumb in the position. Additional elastic loop straps wrap the wrist to give firmly fit and support. The inner foam padding give thumb more comfort and cushion. It was designed to be universal size for both hands