How to Prevent Chafing with Underwear | Stop the Rub Before It Starts

Chafing happens when skin rubs against skin or clothing—and in the groin and inner thighs, underwear is either the solution or the cause. The wrong pair holds sweat, shifts out of place, and grinds raw spots into your skin. The right pair, combined with a few habits, keeps you moving without the burn. Here’s exactly how to make your underwear work for you, not against you.

Why Cotton Underwear Makes Chafing Worse

Cotton is comfortable for sitting still, but when you sweat, it soaks up moisture like a sponge and dries slowly. That wet fabric turns into sandpaper against your skin as you move. The Cleveland Clinic specifically warns against cotton underwear for workouts or hot weather because retained moisture softens the skin and increases friction damage. The fix is simple: switch to moisture-wicking synthetic blends—nylon, polyester, or Merino wool—that pull sweat away and dry fast.

The Right Fit and Style for Chafing Prevention

Fit matters just as much as fabric. Underwear that is too tight compresses the skin and creates pressure points; underwear that is too loose bunches up and rubs with every stride. The sweet spot is snug enough to stay in place but not tight enough to leave marks.

Boxer briefs and longer-leg styles are the strongest choice because they cover more thigh surface and reduce skin-on-skin contact. Flat seams or seamless construction eliminates the rubbed-in groove that traditional side seams dig into your hips. For intense activity, compression shorts or leggings can lock everything down—Cleveland Clinic notes that compression layers are especially effective at reducing friction during exercise, long walks, or any prolonged sweating.

What to Apply Before Activity

Even with perfect underwear, some friction points need extra help. Anti-chafe balms, creams, sticks, and powders create a slick barrier that lets skin glide instead of grip. Apply a thin layer to inner thighs, the groin crease, and anywhere the waistband contacts skin—before you start moving. Cleveland Clinic is clear: anti-chafe products should go on before activity, not after rubbing has already started. Too much product can transfer to clothing and lose effectiveness, so a light coat is enough.

Powders work well for keeping the area dry if moisture is your main trigger, while balms and sticks last longer through heavy sweating. If your skin is already raw, skip these products and let the area heal first.

Post-Activity Habits That Protect Your Skin

Chafing doesn’t always happen during activity—sometimes damp underwear left on after a workout continues the damage. Shower or cleanse the groin area with a gentle cleanser after sweating, then pat dry thoroughly. Don’t rub with a towel; patting avoids further irritation. Change into dry, clean underwear as soon as you can.

For readers ready to upgrade their entire approach, our tested roundup of the best anti-chafing underwear for women covers the specific models and fits that work best for active days.