Good product, if done as shown by one lady, hooking into the loop, the strap will not come off your bra strap.  It did work, I have a dual fold problem and while this did work as stated, if you wear a backsmoother bra, these won't work as it would sit to high.  Even with my other bra, it still tended to sit higher on my back than I wanted.  I am a very busty gal, but so tired of straps that fall off my shoulders.  If you are smaller, these will work wonders for you. I don't regret purchasing them, just dissappointed they won't work with all my bras.