I was naively conned by my hand doctor to buy 2 of these for a total of $160 thinking my insurance covered it….Not! I was unable to return them. I also realized too late that I had a similar one at home, so I don’t need this extra one. It is universal, fits on either hand and they really do a great job of stabilizing the thumb pad area. I never wore this one. My hand size is medium but it is adjustable to go even larger. I can ship with or without the box.