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You notice it around kilometre 18. A faint sting at your inner thigh, or under your arm, or across your nipples. By kilometre 25, it’s burning. By the finish line, you’re walking like you’ve been sandpapered. Chafing is one of those things nobody warns you about when you start running — until it happens, and then you never forget it.
The good news: it’s almost entirely preventable. The bad news: there’s a lot of noise out there about what to use, and not all of it works the same way for every body. What solves the problem for a lean, low-sweating runner doing a 5K might be completely useless for someone doing a 20-mile long run in August.
This article covers the products that genuinely work — and when — along with what’s worth your money and what you can skip.
Why chafing happens (and why it gets worse with distance)
Chafing is friction damage to the skin — caused by skin rubbing against skin, or skin rubbing against fabric. Sweat makes it worse because it carries salt, which is abrasive and dries the skin out. Heat makes it worse because it increases sweat. And distance makes it worse because you’re doing the same rubbing motion thousands of times.
Common problem zones for runners:
– Inner thighs — especially in shorts or looser-fitting kit
– Underarms — where the sleeve seam meets the skin
– Nipples — particularly in men, particularly in cold weather
– Sports bra band — for women, especially in ill-fitting or low-quality bras
– Waistband area — from shorts, tights, or hydration vest straps
If you’re only running 3–5K, chafing may not be an issue at all. Once you’re regularly running 10K+, it becomes something to think about. At half marathon and marathon distances, it can end your race or leave you unable to walk properly for days.
The main product categories: a realistic comparison
There’s no single product that wins for every runner in every situation. Here’s how the major categories stack up:
| Product type | Best for | Not great for | Approx. cost |
|---|---|---|---|
| Balm sticks (e.g. Body Glide, Squirrel’s Nut Butter stick) | Long runs, all-over use, ease of application | Very heavy sweaters — may wear off | £8–£14 |
| Petroleum jelly (Vaseline) | Budget option, nipples, feet | Stains kit, breaks down synthetic fabrics over time | £1–£3 |
| Cream balms (e.g. Runderwear, Lanacane) | Sensitive skin, inner thighs | Messy in a race kit pocket | £6–£12 |
| Anti-chafe shorts/liners | Inner thigh chafing long-term fix | Adds a layer, can feel warm | £20–£45 |
| Nipple guards/plasters (e.g. NipEaze, Bodyglide NipFix) | Male runners in cold/wet weather | Must be positioned carefully | £5–£12 |
| Compression tights/shorts | Thigh chafing + muscle support | Some runners find them too warm | £25–£80 |
Anti-chafe balm sticks: the everyday workhorse
Body Glide is probably the best-known product in this space — and for most runners, it does the job. You apply it like a deodorant stick to any problem area before you run. It’s not greasy, it doesn’t stain your kit, and it stays on reasonably well through a typical long run.
For a run of up to 2 hours in moderate conditions, one application before you leave the house is usually enough. For anything longer, or if you sweat heavily, carry a travel stick or reapply at a fuelling point. The original Body Glide formula works fine. The “For Her” version is functionally similar — the main difference is marketing.
Squirrel’s Nut Butter has built a cult following among ultrarunners and trail runners because it’s thicker and lasts longer on the skin. It comes in a stick and a tub. The stick is easier to carry; the tub gives better coverage. If you’re training for a 16-week marathon programme and your long runs are stretching past 3 hours, the tub format might be worth it.
Vaseline: cheap, effective, but with trade-offs
Vaseline (petroleum jelly) has been used by runners for decades — you’ll see volunteers at marathon aid stations handing it out in paper cups. It works. It creates a thick barrier, it’s cheap, and it’s available everywhere.
The downsides: it’s greasy, it’ll smear on your kit, and research suggests petroleum-based products can degrade certain synthetic fabrics over time with repeated washing. If you’re protecting nipples or feet with it on race day, fine. If you’re using it on your inner thighs every run for months, it may take a toll on your favourite shorts.
For blisters, the best running socks to prevent blisters matter more than any balm — but Vaseline on your feet before a long run, combined with good socks, is a solid combination that most experienced runners swear by.
Nipple chafing: it needs its own solution
This deserves separate attention because it catches male runners completely off guard. A 5K in cotton — fine. A wet half marathon in a technical tee — potentially a problem. You’ll know if you’ve experienced it: the shirt sticking against the nipple for 13.1 miles leaves something that stings in the shower for days.
Two main solutions:
Nipple guards/plasters: Products like NipEaze or Bodyglide NipFix are shaped specifically for this. Simple medical-grade plasters (cut into rounds if needed) also work. Apply them before you get dressed — not after the run starts, obviously. In cold, wet conditions they can come loose, so make sure the skin is dry when you apply them.
Balm stick: Works well in dry conditions and shorter races. Less reliable in heavy rain or for anything over 90 minutes of sweating.
If you’re doing your first big race, nipple protection is not optional — it’s part of your kit list. The NHS guidance on skin care for wounds explains why abrasion injuries need to be taken seriously even when they seem minor.
Clothing as anti-chafe strategy
Products help, but the clothing you choose is the bigger variable. A well-fitted pair of running shorts with built-in liner or compression shorts underneath will do more for inner thigh chafing than any balm on its own.
What to look for:
– Flat seams — raised seams are the enemy, especially at the inseam and under the arms
– Correct fit — too loose means more movement and more rubbing; too tight creates its own pressure points
– Moisture-wicking fabric — keeps sweat moving away from the skin, reducing salt build-up
Runderwear makes purpose-built anti-chafe underwear for runners, which is a real option if you’ve tried every product and still struggle. Some runners swear by compression shorts under their regular kit. Others find compression too warm.
The best running socks to prevent blisters follow the same logic — double-layer socks with flat seams address friction at source rather than just coating the skin.
Race day: what to do differently
Training runs teach you where your problem areas are. Race day is when it matters most — and race day conditions can be different from your training conditions: more nervous sweating, different weather, a race tee you haven’t worn before.
A few rules:
1. Never wear a new shirt on race day. Race t-shirts are the number one cause of unexpected chafing. Wear a tried-and-tested technical tee underneath.
2. Apply balm before you leave, not at the start line. You need it on before the kit goes on, or at least before you start moving.
3. Carry a travel stick if you’re racing half marathon distance or longer. Reapply at mile 10 if needed.
4. Don’t assume it won’t happen just because it hasn’t before. A warm race day when you trained in the cold, or a rainy race when you trained dry — both can introduce chafing that wasn’t a problem before.
Research published in the Journal of Athletic Training identifies skin friction as a preventable injury in endurance sport — the point being that it’s worth treating as a genuine physical risk, not just a minor inconvenience.
The honest takeaway
- Body Glide or Squirrel’s Nut Butter are the best all-round products for most runners. Apply generously to all known problem areas before every long run and every race.
- Vaseline works fine on race day but isn’t the best long-term daily option for synthetic kit. Reserve it for feet, nipples, and emergency use.
- Nipple plasters are non-negotiable for male runners doing anything over an hour in cold or wet conditions. Don’t learn this lesson mid-race.
- Clothing choice matters as much as product choice. If you’re chafing regularly, flat seams, correct fit, and compression shorts are worth investing in.
- Test everything in training, not on race day. That includes any new anti-chafe product — just like shoes and nutrition, your skin needs to get used to it first.