My bra size has recently changed due to pregnancy.  I read that durring pregnancy, it may change several times and didn't want new bras at every stage (expensive!).  Instead I bought this product, which does a great job of letting me get the most out of bras thanks to the new flexibility.  It was super easy to hook on and to remove, but kept the bras just as securely in place as a normal hook.  I liked it enough that I also bought the two hook version after trying this one. I'd highly recommend if you have a temporary size change.