As for the actual wear, you'll be relieved to know the nipples are GMO-free and guaranteed safe on the skin, so you can wear them all day (or night), in the heat, and not have to make a fuss. And, you don't have to go totally braless, either — Just Nips can be worn by themselves or under or over your favorite bras and bralettes. The best way to wear them, according to Borman, is when they're the least expected: "Truly my favorite time to wear them is with a long-sleeve top or knit sweater, like an accessory. It changes up your look and adds a little something extra," she says.