Runner’s nipple happens when sweat and friction break the skin barrier down to blood. Luckily, the community trust a simple hack: Vaseline.

Yet, with more runners than ever, 1 in 4 men still finish marathons with damaged nips. After lab-testing the hack in last year’s Vaseline Verified campaign, we went on a mission to sponsor all nips that run from run club creators to the official Nipple Protectors of the London Marathon.