I nearly jumped for joy when I discovered Strap Perfect ($20 for 9). The idea of making my everyday bra a racerback when necessary is music to my ears. Why don't you simply buy a racerback bra? That's a good question, but why give up my favorite bra if I don't have to? With Strap Perfect — which comes in clear, black, and nude — I get comfort plus utility. As far as I'm concerned, you can't beat that.