This brace is very good. It has a sturdy plastic insert that restricts the movement of the thumb and holds it in a comfortable position. It is a little bulky, especially with the extra adjustment at the top of the thumb. That makes it OK for me, but too cumbersome for my wife's smaller size, even though we ordered her the correct size. The brace does what it says it will do; it will hold the thumb area quite immobile and allow a stretched / torn ligament to heal. Does not promote sweating; does not impede the rest of the hand.