The Extra small was too small so I ordered a ...
The Extra small was too small so I ordered a small which was just right.  If your fingers tend to swell, order a size up. Also, if you have any skin sensitivities, don't sleep with it.  All in all, as long as I can keep track of where I put it, it works very well.  I am having more than 75% less triggering and therefore less pain.
Rating: 5 stars