Maybe it’s the shirts I wear, but I can’t run over 8 miles (12.9 km) without taping my nipples. Winter is worse because my body’s biological response to and the weight of the extra layers combine to guarantee a cheese grater experience. Medical tape works. Round adhesive bandages (except Band-Aid brand which don’t stick well) have been my solution of choice for years and even regular adhesive bandages will work if you are desperate. If you do forget, don’t get in the shower without smearing Aquaphor or petroleum jelly on your nipples first. The screams of noob runners jumping into a hot shower after their first half-marathon race echo around the suburbs every weekend. It’s a mistake you likely won’t make twice.