It is mostly transfer, and mostly it is not on your skin. An hour of skin on skin moves sweat, skin oils and whatever was already living on your partner's gi onto you, and fabric hangs onto all of it far longer than skin does. So if you showered properly, scrubbed like a responsible adult, and still catch a whiff of somebody else at nine in the evening, the smell is almost certainly in your hair, your rashguard, your belt or your kit bag rather than on you. Washing harder will not fix it. Washing the right things will.
In this article
- Why does grappling do this when running does not?
- Where does the smell actually live?
- Why does a rashguard outlast a gi for smell?
- Have you washed your hair, though?
- What if it is just you?
- What actually helps
- What if it is your partner's gi?
- Frequently asked questions
Why does grappling do this when running does not?
Because running is you, your own sweat and your own shirt, with air moving past the whole time. An hour of grappling is an hour pressed against another human being. Their forearm is on your neck, their gi is on your face, and your hair spends several minutes at a time against somebody's chest.
Fresh sweat is close to odourless on its own. The smell develops later, when the bacteria that live on everybody's skin and in everybody's kit get to work on it. So what transfers is not only smell, it is the raw material that becomes smell a few hours from now, which is why it can bloom again in the evening when you warm up. The community description is better than ours:
"Usually when you mix bodily fluids, you will carry a small piece of them with you for a couple days. Even your breath will start smelling like theirs." (r/bjj, Nov 2025)
Slightly horrifying, broadly accurate.
Where does the smell actually live?
Almost everybody attacks the one place it is least likely to be: their own skin.
| Where it lives | How long it lasts | What to do |
|---|---|---|
| Skin | Minutes. Any normal wash clears it | Wash soon after training rather than three hours later |
| Hair | Until you wash it, and it sits by your own nose all evening | Wash your hair too, not just your body |
| Gi, cotton | Until washed. Much worse if it dried folded in a bag | Wash after every session. Hang it the moment you get home |
| Rashguard, synthetic | Longest of the lot. Comes back the next time you sweat | Wash promptly, no fabric softener, soak it if it has been sitting |
| Belt | Indefinitely, because nobody ever washes it | Air it after every session. You are allowed to wash it |
| Kit bag | Effectively permanent, and it re-scents everything you put in | Empty it every time, leave it open, wash it occasionally |
Read the right hand column and notice how little of it is about soap.
Why does a rashguard outlast a gi for smell?
Because of what it is made of. Polyester and elastane are oil loving and water hating. Much of what makes sweat smell is oily, so it binds to synthetic fibre and survives a normal wash in a way it does not survive in cotton, which swells with water and lets more of it go.
Textile researchers have come at this from several angles and landed in the same place. Polyester grips the oily, non-polar compounds behind body odour, and an ordinary wash strips them out of cotton more completely than out of polyester. In one gas chromatography study, laundering removed odorants from cotton more effectively than from polyester, which is how synthetic kit builds up smell across repeated wash cycles in a way cotton does not. Worth knowing: before washing, cotton actually absorbs more of some of those compounds. The difference is not what goes in, it is what survives the wash. Which explains the experience everyone has had. The rashguard comes out of the machine smelling of nothing, then twenty minutes into the next round it smells of last Tuesday. The residue was still in the fibre, waiting for warmth and moisture.
Three things help more than washing hotter:
- Wash it the same evening. A rashguard that spends the night balled up in a bag is the worst case, every time.
- Skip the fabric softener. It leaves a coating on the fibre, and that coating can hold onto exactly what you were trying to rinse out.
- Soak before you wash. For a rashguard that has gone feral, an hour in cool water first does more than a hot cycle and does not cook the elastane. The same logic applies to neoprene, which is why how to get rid of wetsuit smell reads almost identically.
Have you washed your hair, though?
This is the one people forget, and it is the one sitting about fifteen centimetres from their own nose for the rest of the evening. Think about where your head actually goes. Under an arm. Against a chest. Flat on a mat that forty people trained on this week. Then think about how many people scrub their shoulders conscientiously and give their hair a rinse at best.
The usual objection is that training five or six times a week means washing your hair five or six times a week, which feels like a lot. Fair worry, and we wrote about it properly in washing your hair when you train every day. In our view an unwashed head is the likeliest explanation whenever somebody still smells of training after a full shower.
A 3-in-1 bar helps here, though be clear about how. It does nothing clever. It means hair gets washed at the same time as everything else, because the thing you would otherwise skip is already in your hand. A logistics fix, not a chemistry one, and logistics is usually the actual problem.
Shampoo, body and face wash, all in one bar. Cooling, refreshing and designed for those always on the go.
What if it is just you?
We have to raise it. Somebody on r/bjj raised it better:
"Hey its a sweaty sport. In this instance, you're doing all the right things having a shower & using nice smelling products, but after all of this, its probably all in you're head, or, ITS YOU." (r/bjj, Nov 2025, 30 points)
Thirty people upvoted that, which tells you something. Two real possibilities sit inside the joke. The first is that you cannot smell yourself: your nose stops registering a constant background scent within minutes, which is why nobody can assess their own. If you want to know, ask somebody who will tell you the truth, ideally not a training partner you are about to armbar.
The second is more useful, and the same thread named it:
"Tell him. Sometimes you have "work funk" that isn't smelly until sweat activates it and you get foul. Their GI may have residual stink on it as others have suggested, sometimes that is moisture activated as well." (r/bjj, Nov 2025)
Work funk is real and it catches people out. A kitchen, a workshop, a hospital ward, a house where somebody smokes: it settles into hair and clothing unnoticed while you are dry, then arrives all at once when you sweat. If people only ever mention it after rolling, that is the shape of the problem, and the fix is clean clothes before training rather than after.
What actually helps
- Wash soon rather than eventually. The most repeated advice in these threads, and the most boring: "Just shower soon after training. Don't wait 3 hours" (r/bjj, Dec 2025). More on why timing beats almost everything in how soon should you shower after training.
- Wash your hair, not just your body. See above. This is the single biggest miss.
- Unpack the bag the moment you walk in. Not later. Damp gear zipped in a bag overnight is how a one session smell becomes a permanent one.
- Rotate your rashguards. Two clean ones beat one that gets rinsed in a sink and re-worn.
- Wash the bag itself. Most people never have. If everything you own smells faintly of training, the bag is the suspect, because it touches all of it.
- Air the belt. Keep the superstition if you must. Stop leaving it rolled up and damp.
Notice how little of that is about which soap you use. If you are curious anyway, we read all twelve labels sold to grapplers in grappling soap ingredients.
Shampoo, body and face wash, all in one bar. Keep your hair and skin healthy on the go. Monoï-infused scent with a touch of vanilla. Designed for those always on the go.
What if it is your partner's gi?
Then nothing you wash off yourself fixes it, and that is worth saying plainly, because people spend weeks scrubbing harder over a problem that is not on their body.
If the same person keeps leaving a smell on you and nobody else does, the source is their gi, and the answer is a quiet word rather than a better soap. It is an awkward conversation and also a two sentence one. Say it about the gi rather than the person, and in terms of damp storage rather than hygiene, because that is almost always what it is: a gi that dried in a bag instead of on a hanger.
Most people are mortified, fix it within a week, and are quietly grateful nobody let them carry on. The alternative is that the whole room keeps noticing and nobody says anything.
Frequently asked questions
Why do I still smell like my training partner after a shower?
Usually because the smell is not on your skin. Skin washes clean in minutes. Hair, a rashguard, a belt and a kit bag do not, and any of them will keep releasing it all evening. Wash your hair, get the gear out of the bag, and the problem usually goes with it.
Why does my rashguard smell again the moment I sweat in it?
Because synthetic fibres hold onto oily odour compounds more stubbornly than cotton, so a normal wash can leave residue that smells of nothing until warmth and moisture bring it back. A cool soak before washing, and no fabric softener, does more than a hotter cycle.
Does washing hotter get the smell out of training gear?
Less than people hope, and hot washes are hard on elastane. Speed and soaking matter more: gear washed the same evening beats gear that spent two days in a bag and then went through a hot cycle.
How do I tell a training partner that their gi smells?
Briefly, privately, and about the gi rather than about them. Something close to "mate, I think your gi might be drying in your bag" gives them an easy fix and an easy exit. Almost nobody takes it badly.
One bar for hair, body and face.
The bit people skip in the shower is usually their hair. Harder to skip when it is the same bar.
Try Rinsed™ →Community quotes are reproduced verbatim from public r/bjj threads and represent opinion, not fact.
Sources
- Abdul-Bari MM, McQueen RH, de la Mata AP, Batcheller JC, Harynuk JJ, “Retention and release of odorants in cotton and polyester fabrics following multiple soil/wash procedures”, Textile Research Journal, 2020
- Callewaert C et al., “Microbial Odor Profile of Polyester and Cotton Clothes after a Fitness Session”, Applied and Environmental Microbiology, 2014
- Van Herreweghen F, Amberg C, Marques R, Callewaert C, “Biological and Chemical Processes that Lead to Textile Malodour Development”, Microorganisms, 2020
Community quotes are reproduced from public threads on r/bjj, r/wrestling and r/grappling and represent the views of the people who posted them, not findings.
Alexandre, Founder @Rinsed™
