I have tenovitis in a fw dugits, also flareups of tendinitis %26 possible RA, will kn for sure soon.
They help the joint not move, relieving the pain. I have long skinny fingers, as you'll see in 1st 2 photos.
My husband injured his thumb %26 i gave him 1 to try. He has an average sized thumb %26 it is on there %26 helping, but it won't reach to velcro on the designated velcro area, so it's velcroed to the soft part, but its wrking, but his will come loose a fw times, as my won't. So, if small-medium digits, give them a try, but if larger, don't try %26 no guarentee on an average size thumb, if yours may be slightly larger than my husbands, which i give to photos of. They are helping his pain. He's wore it for 2 days now.