I've wanted a pair of these for a long time but refuse to pay $100. I managed to sell them for $70. For this price I still find them too expensive. They fit great and true to size. They are comfortable and add extra grip to hard floor surfaces. I thought maybe they would work against sweaty feet and to an extent they do, but as with all other indoor slippers there are bound to be moments when feet are hot and sweaty. There doesn't seem to be an antimicrobial lining and the slippers stink to high heaven anyway. The underside of the sole is absolutely flat, with no profile. This turns any slippery or wet surface into black ice, which is dangerous. not practical. Overall, I'm very glad I didn't pay $100 for it. Do they cost $70? Probably not, but decent slippers are hard to come by, so maybe they're decent slippers for some people.