It immobilizes the wrist and thumb. This is an EXOS wrist brace in TL that slows the development of degenerative diseases. The splint immobilizes the first metacarpal in a neutral position, preventing it from getting stuck. It is designed to reduce pain and inflammation by not allowing movement in the wrist and thumb. It is made of breathable fabric. It is waterproof so that you can wet it and shower with it. Prepared for daily use and hygiene since it is made of an antimicrobial material that eliminates bad odors. This splint is thermomoldable to adapt to anatomy. It is heated in a hot air oven, at a sufficient temperature to soften the plastic inside. It molds to the person where it hardens.