NipGuards® were designed and patented (by marathon runners) as a foolproof solution to prevent nipple chafing and abrasion without the need for reapplication during a workout and without staining shirts. NipGuards® are effective over any distance and in all weather conditions. In fact, NipGuards® are 100% guaranteed to work in the most grueling tests of human endurance and in the most extreme weather conditions. Whether it’s a simple training run or competing in a 100-mile ultra marathon or a full triathlon, NipGuards® are a proven and effective way to prevent unnecessary nipple chafing and abrasion.