This black neoprene cuff, can be used on either wrist. It extends from below the wrist joint to about halfway up the palm, with a hole cut out for the thumb, to support the joint more fully. Adjustable 50mm wide elastic strap gives excellent support. It can be put on single handed if help is not at hand. Machine washable (cold wash) Neoprene keeps affected area warm, uniform support without muscle restriction.