Best Running Underwear to Beat Burn on Your Bits (2025)

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Why do you trust me? Well, I once ran the equivalent of 67 marathons in 67 days with a 25-pound backpack. This is my toolkit for anyone trying to avoid pain.

Lube up: Anti-chafing products like petroleum jelly or special balms are your best anti-chaf defense. Even if your carefully selected clothes let you down, a generous coating of lube can save the day. You can’t be shy. Especially the bottom. You want to make sure you’re entering a place even if you rarely visit.

Go smoothly: I choose shorts, leggings, base layer shorts, tees and running underwear that are either seamless or have flat-lock seams. I always check the seams of built-in twin shorts, and I rarely trust built-in briefs in regular shorts. When in doubt, layer up with your own trusty undies.

Tighten: I choose tight, body-hugging layers over loose-fitting gear. It sounds counterintuitive but fabric that stays in one place, close to the skin works better than loosely hanging fabric that moves around more.

Avoid cotton: Cotton is heavy and can rub even when dry. When it’s soaked in salty sweat, it’s a disaster for your soft bits. Layers that touch your skin should be made from synthetic or wool-based fabrics. They dry quickly and reduce friction.

Crush your toes: Blisters are essentially nuclear driven and can be difficult to avoid. Powdering my feet and socks can help reduce moisture that increases the risk of chafing and hotspots.

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