What is the Mueller Thumb Stabiliser? Adjustable thumb brace to treat & prevent thumb injuries such as a broken thumb or sprained thumb & to prevent Skiers thumb when skiing. When can I use it? Following a broken thumb. In the treatment & prevention of thumb sprains (Skiers Thumb). ideal to be used when skiing. Which size do I need? One size fits most. Fits either wrist 14-26.7cm (5.5-10.5). How does it work? The Mueller Thumb Stabiliser helps to protect & prevent thumb pain by supporting the thumb, without limiting hand movement. Metal side stays provide support & protection to the thumb which is maintained in a neutral position. The Thumb Stabiliser can be custom fitted using the Velcro straps around the wrist & thumb. By re-enforcing the ligaments at the base of the thumb, the Mueller Thumb Stabiliser can help to reduce the forces applied to the thumb joint & thus protect the thumb from injury. This can be very important during skiing, where the ligaments at the base of the thumb are often damaged during a fall.