These work great! I haven't been somewhere that I'm dripping sweat, but I have worn them a few times in the summer heat and they stayed in place nicely. A great alternative to the slip-shorts I used to always wear under dresses. The sticky edges leave red marks when you take them off, but they're not painful - and that may just be for people like me who have very sensitive skin. I'm planning to buy more in different colors soon! I'm a size 10/12 in pants, bought the size C bandelettes, and they fit nicely. Tight enough to stay up, but not so tight that they dig in.