I measured my thighs and i was at 25" but after reading many reviews regarding the issue of sizing down and rolling fabric I decided to order the suggested size and for the most part they worked. I felt that they were just slightly too big and so next time I will try ordering a size down. I didn't notice much slipping or much rolling but there was some of both happening and they easily moved position when i was adjusting them. They did the job of giving me a pain free night out in a dress.