Quick answer: Chafing is skin irritation caused by repeated friction—skin rubbing against skin, clothing, footwear or equipment. Sweat, heat, poor clothing fit and hours of movement can make it more likely. You can reduce the risk by keeping friction-prone areas as dry as practical, choosing well-fitting clothing with smooth seams and applying a protective barrier before movement.
Chafing can turn an ordinary walk, workout, commute or working day into an uncomfortable one. It usually starts as a warm or faintly tender patch of skin — and if you keep moving, that small irritation can build into redness, stinging and soreness.
Understanding what causes chafing is the first step to preventing it, because chafing is far easier to head off than to soothe. It isn't limited to athletes, hot weather or a particular body type — it can affect anyone when skin, clothing, footwear or equipment rubs the same area over and over. The good news is that the risk of chafing can often be reduced with suitable preparation: the right clothing, a little moisture management, and a protective anti friction cream or balm applied beforehand.
What is chafing?
Chafing is surface irritation caused by repeated rubbing. The outer layer of skin acts as a protective barrier, but continual friction gradually wears at it — moving from mild warmth to redness and stinging, and, if the rubbing continues, to raw, cracked or blistered skin.
It helps to picture chafing as stages rather than a single event. The area first feels warm or unusually sensitive; then it turns red, tender and itchy; and if the friction carries on, the skin can become raw, cracked or even blistered. Chafing can flare quickly during intense exercise, but it also creeps up over hours — someone walking round a new city, working a long shift or wearing unfamiliar shoes often won't notice until the skin is already sore. Catching it at the warm-and-tender stage is much easier than letting it reach broken skin.
What causes chafing?
Chafing is caused by friction, but it rarely comes down to a single thing. It develops when several factors stack up at once — skin rubbing on skin, moisture, pressure and time all combine to turn ordinary movement into irritation.
A simple way to think about your risk:
Movement + moisture + pressure + time = greater friction risk
A short walk in dry, well-fitting clothes may not bother your skin at all. The same walk on a hot day, in damp clothing, with a raised seam pressing on your thigh, is a completely different situation. Chafing can be common among road runners. In a cross-sectional study of 76 road runners in southern Brazil, researchers identified chafing in 42.1% of participants.[1] Although this was a relatively small and specific group, it shows that chafing was a frequent concern within this particular sample.
Skin rubbing against skin
Skin-on-skin contact is one of the most common causes, affecting spots where two surfaces meet as you move: inner thighs touching while walking, upper arms brushing the sides of the body, the groin during running or cycling, and the area beneath the breasts or around the bra line. Duration matters as much as force — a small amount of rubbing repeated thousands of times can irritate more than brief, firm contact.
Clothing rubbing against skin
Clothing is meant to protect you, but the wrong garment can become the source of friction. Rough or stiff fabric, raised seams, labels, tight waistbands, underwear edges and badly placed bra bands can all rub, and fabric that bunches or turns damp shifts differently against the skin. A shirt that feels fine at the start of a run can start rubbing once it's wet; loose shorts can slide across the same patch repeatedly, while overly tight clothing adds pressure and restricts movement.
Sweat and dampness
Sweat doesn't cause chafing by itself, but it creates the conditions where friction does more harm — damp fabric clings and moves differently against skin, and dried sweat can leave gritty salt that adds abrasion. It's a major reason running, gym training, hiking and warm, humid days so often bring chafing on.
Heat and humidity
Hot weather increases sweating and humid air slows evaporation, so chafing shows up more on summer holidays, festivals, warm commutes and long days out. It isn't only a summer problem, though — layers, heavy workwear or insulated kit can trap heat and moisture against the body in cold weather too.
Repetitive movement
The more often an area moves against another surface, the more chance friction has to build. Different activities concentrate that rubbing in predictable places:
|
Activity |
Likely friction areas |
Common contributing factors |
|
Running |
Inner thighs, nipples, underarms, feet |
Sweat, fabric movement, repeated strides |
|
Walking |
Thighs, heels, toes, waist |
Long duration, footwear, warm weather |
|
Cycling |
Groin, inner thighs, seat area |
Pressure, fitted clothing, repetitive movement |
|
Gym training |
Underarms, bra line, waist, thighs |
Perspiration, varied body movements |
|
Hiking |
Feet, shoulders, thighs, waist |
Boots, backpacks, extended activity |
|
Travelling |
Thighs, feet, shoulders |
Walking, luggage straps, unfamiliar clothing |
Footwear, straps and grit
Feet are especially exposed because they carry your weight while moving inside socks and shoes — chafing there comes from footwear that's too tight or too loose, damp socks, internal seams, or trapped sand and grit. Anything else that moves against you repeatedly can rub too: backpack and hydration-pack straps, running belts, sports bras, tool belts, harnesses and even wearables. Adjust equipment before you set off and check it again after a few minutes, since straps often settle or shift once you're moving.
Why does sweat and heat make chafing worse?
Sweat and heat make chafing worse because moisture can substantially increase the friction between skin and fabric. Damp skin tends to drag rather than glide. The size of the effect varies with the fabric, body area and level of moisture, but the direction is consistent.
In one laboratory study, wet skin produced approximately twice the friction measured under natural skin conditions, [2] while other research has reported a range of results depending on the fabric, moisture level and testing method. Water softens the skin's outer layer and increases how much of it is genuinely in contact, so it grips more. This helps explain why humid days, sweaty runs and damp clothing so frequently contribute to chafing — and why keeping skin as dry as practical is a useful part of prevention.
Where does chafing commonly develop?
Chafing can appear anywhere that gets repeated contact, but some areas are affected more often than others: the inner thighs, groin, underarms, nipples and chest, the bra line, and the feet — anywhere two surfaces move against each other for long enough.
The inner thighs are among the most commonly affected areas, rubbing together while you walk, run or exercise, and no single body shape is exempt — leg position, stride, clothing and duration all play a part. The groin is warm, covered and constantly moving, so seams, fitted kit and sweat can irritate it quickly. For a more detailed explanation of the symptoms, causes and prevention methods, read our complete guide to groin chafing in men. Under the arms, skin, fabric or seams rub with every arm swing. Nipple chafing is a well-known problem for runners, where a shirt drags over damp skin for miles — our tips to prevent nipple chafing when running cover it in more detail. A bra band that shifts, fits too tightly or traps moisture can irritate the skin beneath the breasts, and shoes and socks rub the heels, toes and soles until a small hotspot becomes a blister.
Who can experience chafing, and why does it start suddenly?
Anyone can chafe — it's a friction issue, not a reflection of fitness, hygiene or body size. When chafing starts suddenly after never being a problem, it usually means something in the friction equation has changed: hotter weather, a new activity or longer distances, different clothing, or a change in body weight.
Runners and cyclists chafe often because their sports involve so much repetitive movement, but walkers, hikers, gym-goers, travellers, shift workers, people in uniforms or safety gear, and anyone wearing a dress or breaking in new shoes are all susceptible too. If it's suddenly happening to you, look for what changed — a heatwave that softened skin and raised sweat, a new seam or fabric that holds moisture, or a big travel day well above your usual step count. It responds to the same simple fixes whatever the trigger.
What does early chafing feel like?
Chafing usually warns you before the skin is badly irritated. Watch for unusual warmth, tingling, mild stinging, a localised tender patch, a red line under a seam, or a heel that feels hot inside a shoe. These early spots are called hotspots — and acting on them is what stops a minor niggle becoming a blister.
Don't push through a hotspot on a long day. Stop, check the area, adjust the clothing or equipment causing it, dry the skin, and apply friction protection where appropriate. Carrying on through discomfort is a common way a manageable irritation turns into raw, broken skin.
How can you prevent chafing?
You reduce chafing by lowering friction before any soreness starts. That means knowing where you usually rub, starting with clean dry skin, wearing clothing that fits and manages moisture, checking your shoes and straps, and — as one practical addition to that wider routine — applying a protective barrier to your hotspots beforehand.
Start by using your own history as a map. Think back to previous walks, runs or long days: which areas got warm or tender, was your clothing wet, did a seam or strap cause it, and did trouble begin after a certain distance? Those answers tell you where to focus. Then give yourself the best possible starting point — wash away old sweat and residue, dry the skin gently, and put on clean, dry clothing, replacing damp socks or underwear promptly.
Clothing should support movement without sliding, bunching or pressing: look for a comfortable fit, smooth or covered seams, breathable moisture-managing fabric and enough coverage between rubbing surfaces. There's no perfect fabric for everyone, so test new kit on an ordinary outing before a race, holiday or long shift. The same goes for footwear — general dermatology guidance, including the American Academy of Dermatology's advice on friction blisters, is to wear shoes that fit properly (neither too tight nor too loose), keep socks clean and dry, and stop when you feel a hot spot rather than pushing on.[3] Applying a barrier or anti chafing cream to your known hotspots before you start — covering the whole friction zone, not just the point that hurt last time — and reapplying during long, hot or wet activity, rounds out a solid routine.
Chafing prevention checklist for active days
- Know your hotspots from past walks, runs and long days
- Start on clean, dry skin
- Wear well-fitting, moisture-managing clothing with smooth or covered seams
- Check footwear fit and keep socks clean and dry
- Adjust straps, bags and equipment before you move — and recheck once you're going
- Apply a protective barrier to friction-prone areas beforehand
- Reapply if it gets hot, wet or the day runs long
Barrier, powder or petroleum jelly: which option should you choose?
Different friction-control products work in different ways. Powders can help manage moisture, while petroleum jelly and anti-chafe balms create a smoother layer between rubbing surfaces. The most suitable choice depends on the body area, activity, weather, preferred texture and how often you'll need to reapply.
|
Method |
Potential advantages |
Points to consider |
|
Powder |
Helps absorb moisture and feels lightweight |
May need reapplication during heavy sweating |
|
Petroleum jelly |
Widely available and helps reduce rubbing |
Some people find its texture greasy or messy |
|
Anti-chafe balm |
Convenient direct application and easy hotspot coverage |
Performance depends on the formula, amount applied and activity |
|
Protective dressing |
Shields a specific hotspot from contact |
Must stay securely positioned during movement |
A purpose-made balm can be especially convenient for direct application before walking, running or working, but no single format is automatically best for every person or activity.
How does Oltra Glide help reduce chafing?
Oltra Glide is a refillable, naturally derived glide anti chafe balm designed to create a smooth, breathable barrier over friction-prone skin. It applies directly without requiring hand application, and can be used before sport, work, walking, travel and everyday movement.
Made with plant-based ingredients and free from petroleum, parabens and aluminium, it comes as a reusable applicator with a 40g refill—so you keep the applicator and simply swap the refill when it runs low. Used as a natural anti chafing cream alternative in balm form, it is applied to clean, dry skin over the whole hotspot, then reapplied as needed during heat or over long distances. Runners can learn more about choosing and using friction protection in our guide to the best natural anti-chafing cream for runners.
What should you do if your skin is already chafed?
Once skin is sore, the priority shifts from prevention to recovery: stop the source of friction, clean the area gently with lukewarm water and a mild cleanser, pat it dry rather than rubbing, and protect it from further rubbing with loose, soft clothing. Don't treat broken, bleeding or infected skin as an ordinary hotspot, and don't keep going through it.
Mild chafing often begins improving once the source of friction is removed, although recovery time depends on how irritated or damaged the skin has become. Avoid scrubbing, exfoliating or heavily fragranced products on irritated skin, and hold off on repeating the activity until the area feels comfortable again. When it has healed, go back to prevention so the same spot is less likely to flare next time.
When should you seek medical advice?
Minor chafing can often be managed with gentle home care, but contact a pharmacist or GP if the pain is severe, the skin is deeply cracked or bleeding, redness is spreading, the area feels increasingly hot or swollen, there's pus or a yellow discharge, an unpleasant smell develops, you feel unwell, or the same problem keeps returning. Broken skin can let infection in, so these signs shouldn't be ignored.
Anyone with diabetes, reduced circulation, impaired sensation or a condition that affects healing should seek personalised medical advice sooner rather than later, since skin injuries can develop more quickly and heal more slowly.
Why choose Oltra Glide?
Oltra Glide anti chafe balm is a natural, refillable anti-chafe balm made for people who move. Rather than promising to solve every situation, it focuses on doing one thing well: laying down a smooth, breathable barrier over friction-prone skin, in a clean, refillable format you can rely on day to day.
Here is what it offers:
- Naturally derived formula. Plant-based ingredients, and free from petroleum, parabens and aluminium. Vegan and cruelty-free.
- Refillable by design. You keep the reusable applicator and swap a 40g refill when it runs low, which helps cut packaging waste and keeps the cost-per-use sensible over time.
- Clean, direct application. It twists up and glides straight onto the skin — no tubs and no greasy fingers — so it's quick to apply and reapply.
- Made for friction-prone areas. Designed for the inner thighs, groin, underarms, chest and nipples, the bra line, feet, neck and waistband.
- Four unisex scents. Choose Core (unscented), Rise, Spark or Flow on preference rather than gender.
No single product prevents every case of chafing, and clothing, moisture management and equipment fit all still matter — but as the barrier step in your routine, Oltra Glide is built to be simple, natural and easy to keep using.
Frequently asked questions about chafing
What is the main cause of chafing?
The main cause is repeated friction — skin rubbing against other skin, clothing, footwear or equipment. Moisture, heat, pressure and long periods of movement all increase how much irritation that rubbing produces, which is why chafing so often appears on hot, active or long days.
Does sweat cause chafing?
Sweat is usually a contributing factor rather than the sole cause. Damp clothing clings, shifts and bunches against the skin, and moisture can substantially increase skin-to-fabric friction — in one laboratory study, wet skin produced roughly twice the friction of skin in its natural condition.
Why do my thighs chafe when I walk?
Your inner thighs likely touch and rub with each step, or clothing repeatedly moves across the inner leg. Heat, sweat, walking distance, fabric and garment fit all influence whether irritation develops. The inner thighs are among the most commonly affected areas, and often respond well to a barrier plus fitted shorts under looser clothing.
Should anti-chafing protection go on before or after exercise?
Apply preventative products before movement begins. Cover your known hotspots while the skin is clean and dry, then reapply according to the product instructions and the length or intensity of the activity. Waiting until skin is already sore makes it much harder to manage.
Can chafing happen without exercise?
Yes. Everyday walking, working, travelling, wearing a uniform, carrying a bag or simply spending time in warm weather can create enough repeated friction to cause chafing. It's a friction issue, not an exercise-only one.
Can chafing become infected?
Severely irritated or broken skin can become vulnerable to infection. Increasing pain, warmth, swelling, pus, spreading redness or an unpleasant smell should be assessed by a healthcare professional rather than treated at home.
About Oltra
Oltra is a UK wellness brand with a straightforward belief: natural care should genuinely perform. We combine plant-based ingredients with a practical, science-minded approach to make products for real movement — the run, the shift, the long walk, the travel day and the heat in between. Everything we make is naturally derived, vegan and cruelty-free, and built around a reuse-and-refill system, so it's care you can feel good about using every day. No greenwashing and no empty promises — just honest formulas designed to help you move with less friction.
Prevent friction before it disrupts your day
You don't need to wait for the familiar sting. Prepare the spots that usually rub, and apply a protective barrier before you move. Oltra Glide is a natural, refillable anti-chafe balm that glides on directly, forms a breathable layer, and refills instead of running out.
The Starter Pack is £15.95: one reusable applicator and one 40g refill in your choice of Core, Rise, Spark or Flow.
Shop the Oltra Glide Starter Pack
✓ Free UK shipping on orders over £12 ✓ Vegan & cruelty-free ✓ Aluminium-, paraben- & petroleum-free ✓ Refillable
Sources
-
Purim KSM, Leite N. Sports-related Dermatoses Among Road Runners in Southern Brazil
https://pubmed.ncbi.nlm.nih.gov/25054745/ -
Vilhena L, Ramalho A. Friction of Human Skin Against Different Fabrics for Medical Use
https://www.mdpi.com/2075-4442/4/1/6 -
American Academy of Dermatology: How to Prevent and Treat Blisters
https://www.aad.org/public/everyday-care/injured-skin/burns/prevent-treat-blisters
This article provides general educational information about skin friction and chafing and is not a substitute for medical diagnosis, treatment or personalised advice from a qualified healthcare professional.