I bought this to try & wear to a wedding. I wear a 34d but bought a c cup because I like the fit better that way on bra like this. I opened the package & it was pretty basic & easy to use. I got it on & had to make a couple adjustments but it fit good & stayed in place... until I started to sweat. The tab on the one side started to raise a little but the rest of the bra stayed exactly where it needed to be. I did have to take it off & switch bra before I left but it stayed mostly in place for the 2 hours I was running around getting ready. I'm going to get I sweat & moved less when I actually got to the wedding but I didn't want to risk it but summers coming so I'll get another chance to check it out.