I'm cheap, but I'm also willing to pay for something it if really works. These really work. I have size 10 feet and was a little nervous that they'd be small, but fit perfect. Maybe they're perfect because of that. I've see other people wear similar items but they'd always poke out of their shoes and it was really obvious that they had something on. Not so with these - even with my more minimal flats you can't tell I have them on. They just cover my toes and the back of my heels, but don't slip off. They have a little gripper on the back of the heel and something in the front by your toes to help it stay in place.