They are too big to not move all over the place. Very bulky "pad" inserts are really a 9x6 piece of cloth like a baby bib?? that you have to fold in half 2x and put in these holder things on top and bottom. Very bulky. I'm 5.8 and large boned too, I can't imagine a petite person using these. They feel like diapers. I'm going to try another brand that has a contoured shape that would actually snap securely to the crotch of panties. There is so much room where they attach the whole thing could spin around. It's not any more secure than putting a wash cloth in your underpants. Boo. And expensive too.