Ron Hill Nip Guards, White, One Size Used primarily by male athletes (woman typically wear bra's and do not experience the problem). Adhere directly to the nipple, not the chest. Water and sweat proof. Will not fall off until you decide to remove them. Works in all weather conditions. Heat, humidity, rain, wind, cold and snow. Great for running, swimming, cycling and triathletes. Also available in Double-Pack (20 pairs).