NipGuards Bulk Pack (100 Pairs) - Guaranteed Nipple Protection Since 1998 for Endurance Athletes. Complete Protection in All Race Distances - Even Ultra Marathon 100 Milers! Water Proof. Sweat Proof. Used primarily by male athletes (woman typically wear bra's and do not experience the problem). The Bulk Runner's Pack contains 100 pairs of NipGuards. Each disposable pair is good for one long training run. NipGuards adhere directly to the base of the nipple (not your chest) and are 100% guaranteed not to fall off until you decide to remove them Works great in all weather conditions: Heat, Humidity, Rain, Wind, Cold and Snow