S. Dawn
First of all, I will say that these do feel nice and cooling when I first put them on. This feeling starts to fade within a few minutes, though. Unfortunately, they didn't stay on very well. I've tried them three different times now, and at best, they stayed on for about an hour before falling off. With the first one, I put it on my knee. When it fell off, I wasn't super surprised. I figured the joint might cause it to fall off, and I figured that wasn't the best place to use it. The other two times, the affected area was an arm, a little past the elbow, so I figured they'd stay on at least a little longer there. Unfortunately, they didn't.
In all three cases, clothing may have rubbed against the pads, causing them to fall off. If they fall off that easily, though, I have a feeling that other people are going to have issues keeping them on. My guess is that they may stay on okay if you have them on a place that's not going to rub against anything or bump against anything. They might be fine for some uses, but blisters and chafing are listed as reasons to use these. In both cases, you are probably trying to protect the area from more irritation, and you are likely to experience some rubbing against the pad. These probably won't stay on long in either case. The directions do say that you can hold them in place with tape, but if I have to use tape anyway, I might as well use a product that's going to stay in place on its own.
Updated April 3, 2023: I have continued to try these in a variety of places. Ultimately, they do stay in place best on a flat body surface where you don't have a lot of muscle movement. The back seems to be the best place. Even on the arms and legs, you have a lot of muscles that make the patch come loose easily.