Runners mid-stride in a city half marathon, bibs pinned on, spectators and cones along the course

Why Your Shirt Rubs Your Chest Raw on Long Runs, and What Runners Put On It

October 27, 2026

Race day: thousands of strides in the same shirt, and every one of them slides over the same two spots.

The short answer: Your shirt rubs your chest raw because a long run slides the same fabric over the same two spots for thousands of strides, and a wet shirt drags harder. Race in a shirt you've already run long in, and before you dress, smooth a thin layer of Dr. Nice's Sports Hydrogel for Runners over each nipple. Afterward, it cools and soothes chafe.

Why Runners Reach for Dr. Nice's Sports Hydrogel for Runners

You can't stop your shirt from moving for 26.2 miles. You can give the skin underneath something between it and the fabric. Here's why it earns a spot next to the bib:

It goes on before the shirt does. A thin layer over each nipple dries clear in about 30 seconds into a thin, breathable barrier that shields the skin from the shirt sliding over it.
It cools and soothes chafe after. It's a water-based hydrogel that cools on contact and soothes skin the miles have rubbed raw.
No sting. On a spot that already smarts in the shower, the last thing you want is a product that smarts too.
Not greasy, no stains. It won't leave oily marks on a tech shirt, a race singlet or the white shirt you're wearing in the finish photo.
Pocket size. The 30 mL airless pump fits a running belt or vest pocket, so you can add more at mile 13 without stopping for long.
Pharmacist-formulated. Formulated by pharmacist Dr. Frank J. Nice, RPh, DPA, CPHP, so it's gentle enough for the most sensitive spot a shirt can find.
Five clean ingredients. Water, poloxamer, gluconolactone, sodium benzoate and a minuscule amount of peppermint oil for a light peppermint scent. Vegan, and made in the USA in an FDA-registered facility.

Shop Dr. Nice's Sports Hydrogel for Runners →

Why Your Shirt Rubs Your Chest Raw on Long Runs

It never shows up at mile 3. It shows up at mile 16, somewhere between your second gel and the long hill, as a hot little sting every time your arms swing. You finish, step into the shower, and the water finds it before you do.

Every runner who has done a few fall marathons knows the finish-line photo: a white shirt with two red lines running down the front. Nobody frames that one.

A runner late in a race pulling his soaked shirt off his chest where it rubs, other runners behind him

Here's what's going on. On every stride, your shirt shifts a little over your chest. One stride is nothing. A 20-miler is three hours or more of that same small slide over the same two spots, and nipple skin is thin and sensitive. MedlinePlus, describing friction blisters, puts the rule simply: they "often happen when there is friction - rubbing or pressure - on one spot." Your chest takes the same rubbing your heel does, just with a shirt instead of a shoe.

The miles matter. A study of road runners in southern Brazil, published in the journal Anais Brasileiros de Dermatologia, found jogger's nipple (the old runners' name for it) in 5 of the 14 people running 65 km, about 40 miles, or more a week, against 1 of the 28 running 24 km, about 15 miles, or less. The authors put it down to friction and "contact with T-shirts or jerseys made from nylon or coarse fibers." Marathon training is exactly when your weekly miles climb, which is why so many runners first meet this problem in October.

Runner Nipple Chafing: Who Gets It and Where It Starts

It isn't only a guy problem, and it isn't only about the nipple itself. The usual suspects:

Men in a shirt and nothing else. There's no layer between the skin and the fabric, so the shirt does all its rubbing right there.
Women at the edges of the sports bra. The cups often cover the nipple, but chafe shows up where the bra moves: along the underband, at a seam, under a strap edge, or on the nipple when the bra slides a little on every stride.
The shirt itself. A rough weave, a seam across the chest, a stiff printed logo, or the brand-new shirt from the race expo you've never worn past the parking lot.
Wet days. Rain or a warm, sweaty run soaks the shirt. It gets heavy, clings and drags instead of sliding.
The long ones. Short runs rarely do it. Your 18s and 20s, and race day, are where it lives.

Before the Run: What Runners Put On It

Dr. Nice's Sports Hydrogel for Runners on the curb at a race start beside a race bag and bib, runners heading off behind

1. Pick the shirt that's already been through a 20-miler

Your race shirt should be the one that's proven itself on your longest runs. If it didn't rub at mile 20 in training, it's your best bet on race day. The free race shirt can come out at the post-race brunch.

2. Run your hand over the inside

Feel for seams, tags and printed logos that sit across your chest. Women: check the underband and where the straps meet the band. If something feels scratchy standing still, it won't feel better after three hours of running.

3. A thin layer of Dr. Nice's Sports Hydrogel for Runners, then the shirt

Dispense a pearl-sized amount onto your finger and smooth a thin layer over each nipple, plus anywhere the bra has rubbed before. It dries clear in about 30 seconds. If it dries white, you used too much: rinse, dry and reapply a smaller amount. Once it's dry, get dressed and pin on the bib.

4. Bring the pump on the long ones

On any run over two hours, tuck the bottle in your belt or vest pocket. Put more on at a water stop, or the moment you feel the first hint of a rub.

5. Have a plan for rain

On a wet morning, put it on before you go, carry the pump, and leave a dry shirt in your bag or with whoever's meeting you at the finish.

If It's Already Sore on Race Morning

Maybe Sunday's last long run left a mark, and now it's race week with a tender spot that hasn't quite settled. Look at it in good light first.

If the skin is intact (pink, rubbed, tender, but not broken): this is the job Dr. Nice's Sports Hydrogel for Runners is made for. After your shower, pat it dry, smooth on a thin layer and let it dry before the shirt goes on. Carry the pump.
If it has cracked, blistered or is bleeding: our gel is for intact skin, so skip it there. MedlinePlus's advice for friction blisters fits: put a bandage on to keep it clean, and make sure there's no more rubbing or friction on it. A soft bandage that stays put under the shirt is your friend today.
New to the gel? Try it on a short run this week first. Race morning is a bad time to try anything for the first time, including us.

After the Finish Line

You're done. Get the medal, get the photo, then look after your chest before the drive home.

Get out of the wet shirt. As soon as you can, swap it for something dry and soft.
Rinse, then pat. In the shower, let lukewarm water run over it rather than scrubbing, then pat the skin dry with a clean towel.
Cool it down. Smooth on a thin layer of Dr. Nice's Sports Hydrogel for Runners. For an extra-cool feel, chill the bottle about 10 minutes in the hotel fridge or a cup of ice: the gel turns into a thin liquid and thickens back up as it warms on your skin.
Go loose. A soft, loose shirt for the rest of the day. Reapply as often as you need.

The Race-Week Bag, Chest Edition

The shirt you've already worn on a 20-miler (and a dry one for after)
Dr. Nice's Sports Hydrogel for Runners, in the belt pocket, not the checked bag
A few soft bandages that stay put on skin
A zip-up layer for the start corral and the walk back
A small towel and extra safety pins

For more on keeping your skin in one piece through training, read The Reality of Running-Related Skin Irritation and Smart Running: The Science of Hydration, Friction, and Peak Performance.

When to See Your Doctor

Most chest chafe is a few uncomfortable days and a good story. Call your doctor if:

The skin is draining pus, or the area is red, swollen, warm or very painful
You have a fever
It keeps getting worse instead of settling with a few easy days
Anything on your chest doesn't look or feel like a rub

If you're not sure, ask your doctor or pharmacist.

Frequently Asked Questions

What should I put on my nipples before running?

Dr. Nice's Sports Hydrogel for Runners. Before you get dressed, smooth a thin, pearl-sized layer over each nipple and give it about 30 seconds to dry clear. It dries into a thin, breathable barrier that shields the skin from the shirt, and it won't leave greasy marks on tech fabric.

What can I put on chafed nipples after running?

Dr. Nice's Sports Hydrogel for Runners. Rinse with lukewarm water in the shower, pat the area dry and smooth on a thin layer. It cools on contact and soothes chafe with no sting. For an extra-cool feel, chill the bottle in the fridge for about 10 minutes first. If the skin has cracked or is bleeding, keep it clean and covered with a bandage instead, and keep the shirt from rubbing it.

How do I stop nipple chafing when running?

Dr. Nice's Sports Hydrogel for Runners, plus the right shirt. Run in a shirt you've already worn on long runs, check it for rough seams or a stiff printed logo across the chest, and put a thin layer of the gel on each nipple before you dress. On long or wet runs, carry the pump and put more on at a stop.

How do women stop nipple chafing when running?

Dr. Nice's Sports Hydrogel for Runners goes anywhere the bra rubs: a thin layer on the nipples, along the underband and under any seam or strap edge that has rubbed before. Race in a sports bra you've already run long in, one that stays put instead of sliding a little on every stride.

Can your nipples bleed from running?

Yes. On a long run, a shirt sliding over the same spot for hours can rub the skin until it cracks and bleeds, which is where the two red lines on a white race shirt come from. A study of road runners linked it to higher weekly mileage and to shirts or jerseys made of coarse fibers. Keep broken skin clean and covered, and see your doctor if it looks infected.

Is nipple chafing worse running in the rain?

It can be. A soaked shirt gets heavy and clings, so it drags across your chest instead of sliding. On a wet day, put the gel on before you go, carry the pump so you can add more, and change into a dry shirt as soon as you finish.

What kind of running shirt helps with nipple chafing?

One that's soft, fits well and has already been through your long runs. Skip anything scratchy, and check for seams or printed logos that sit right across your chest. Race day is the wrong day to wear a shirt for the first time, even the free one from the expo.

When should I see a doctor about chafed nipples?

See your doctor if the skin is draining pus, or the area is red, swollen, warm or very painful, or you have a fever. Anything on your chest that doesn't look or feel like a rub is worth a visit too. If you're not sure, ask your doctor or pharmacist.

The Bottom Line

Your shirt is going to move for every one of those 26.2 miles. Pick the one that's already proven itself, give your chest a thin, clear layer before you dress, carry the pump, and look after the skin when you're done. Whether you're chasing a new PR or just hoping to finish with your shirt still white, reach for Dr. Nice's.