I'm a long-ish distance runner, and these were certainly an interesting experience for my feet! You slide them on and, after a few minutes, feel a tingling, mildly burning (in a good way) sensation.
Candle warmers are already safer than going the traditional route and lighting the wicks, but this one is even more so ...
The anti-slip base ensures no sliding around — just solid support for your intergalactic adventures in reading (and home ...