Best Running Underwear to Prevent Chafing for Men (Why Undies Matter)
The best running underwear to prevent chafing is moisture-wicking synthetic or merino, seamless or flat-seam, in a snug boxer-brief or longer-leg compression cut. Skip cotton entirely. It holds sweat against your skin and that moisture is what turns friction into a raw patch by mile three.
Chafing happens where fabric rubs the same spot over and over, and it gets worse the longer and sweatier the run. The fix is mostly about fabric and fit, not toughing it out. Here is what to look for and what to do if you are already chafed.
This article contains affiliate links. If you buy through them, we may earn a small commission at no extra cost to you.
What to look for in running underwear
- Fabric: moisture-wicking synthetic (polyester or nylon blend) or merino wool. Never cotton.
- Seams: seamless or flat-seam construction so nothing rubs a ridge into your skin.
- Fit: snug boxer-briefs or longer-leg compression styles, not loose boxers.
- Waistband: wide and soft, so it stays put instead of riding or rolling.
- Backup: an anti-chafe balm on hot spots before a long run.
- Compression support: Our compression shorts use Ergonomic design and 4-way stretch fabric...
- Breathable & Quick-dry: These compression underwear for men are made of spandex fabric...
- BOXER BRIEF 5-PACK: The essential 5-Pack Active Stretch Boxer Brief from PUMA is...
- BUILT FOR PERFORMANCE: We created these PUMA boxer briefs with quick-dry, moisture wicking...
- 3-PACK: Contains 3 pairs of men's underwear.
- ALL-DAY COMFORT: Experience comfort with men's underwear boxer brief, ideal for active...
Boxer-briefs or compression, not regular boxers
Regular boxers are the worst choice for running. They are loose, the material bunches, and the extra fabric is exactly what creates friction with every stride.
Boxer-briefs solve this by combining a brief’s snug hold with enough leg coverage to stop thigh rub. They sit close to the body, so there is little loose material left to chafe.
Longer-leg compression underwear goes a step further. The extra length covers more of the inner thigh, which matters most for runners who chafe between the legs rather than at the waist. Either style beats traditional briefs or boxers for distance running.
Why moisture-wicking fabric matters more than style
Chafing is friction, and friction gets worse with moisture. Sweat-soaked cotton clings, drags, and rubs raw skin with every step. Synthetic blends and merino wool pull sweat away from your skin instead of holding it.
That single swap, cotton out, synthetic or merino in, fixes more chafing problems than switching brands or styles ever will. Pair it with seamless construction and the rub has almost nowhere left to start.
If you run in shorts with a built-in liner, the same fabric rule applies to the liner itself. Worth checking next time you shop for running shorts with built-in liners.
Anti-chafe balm for long runs
Even the right underwear will not stop chafing on every run, especially in heat or on distances past your usual range. Add a thin layer of anti-chafe balm on your inner thighs, waistband line, and any spot that has chafed before. It gives a slick barrier fabric alone cannot.
Apply it before you start, not after you feel the burn. Balm works as prevention. Once the skin is raw, it stings going on and does less good.
- Includes one (1) 1.75-oz. Gold Bond Friction Defense anti chafe stick with aloe
- Gold Bond thigh chafing stick comforts the skin from irritation while offering thigh...
- Prevents and relieves hot spots on feet, and chafed, chapped and cracked skin from head to...
- Suitable for fitness, big and plus sizes, work, military, law enforcement, travel, hot...
- Additional Ingredients To Help Hydrate Skin And Retain Moisture. Rich In Vitamins A, B, E...
- Apply Before You Put On Clothes, On Inner Thighs, Around (Sports) Bra, Wherever Skin Is...
You can compare men’s running underwear on Amazon for current seamless and moisture-wicking options. For backup on long or hot runs, see anti-chafe balms on Amazon.
If you are already chafed
This is general comfort advice, not medical advice. See a doctor if the skin is broken badly, infected, or not improving.
- Wash gently. Treat broken skin like a minor wound. Clean it, then pat dry, never rub.
- Cool the area. A cool, damp cloth calms redness and inflammation.
- Moisturize. A plain moisturizer or aloe vera gel softens the skin while it heals.
- Seal it. Once moisturizer absorbs, a thin layer of petroleum jelly cuts friction on your next run.
- Rest if needed. Give a bad chafe a day or two before you run that route again.
Do beginners need special running underwear?
Not necessarily. A short 30 to 45 minute run rarely causes chafing, so beginners can skip the upgrade at first. Once your runs get longer or more frequent, proper running underwear or shorts with a built-in liner become worth the cost.
Long runs also raise your hydration needs. Plan how you will carry water on long runs at the same time you sort out your underwear.
The bottom line
Choose moisture-wicking synthetic or merino, seamless or flat-seam, in a snug boxer-brief or longer-leg compression fit. Skip cotton. Add an anti-chafe balm for long or hot runs, and you will rarely think about chafing again.
