Stabilizes the thumb MP joint in neutral to protect ligaments and reduce painful grinding at the MP and CMC joints. Thin and lightweight, it's the right choice for “gamekeeper's” or “skiier's thumb” and CMC and MP arthritis. Hand-based splint does not interfere with wrist or CMC motion. Provides firm control with little bulk and can be worn inside gloves and mitts. Felt lining is included for customizing the splint for comfort.