Washed your gi on hot once? Now it’s two sizes smaller. That mistake costs you a gi — and it happens fast.
Wash your BJJ gi cold (30°C / 86°F max), turned inside out, with a gentle sport or enzyme detergent. Air-dry flat or hang — never put it in a dryer. Heat is what shrinks gi fabric. Get these two things right and your gi stays the size you bought.
Key Takeaways
- Cold water (30°C max) + gentle enzyme detergent = the safe wash, every time
- Air-dry flat or hang in the shade — the dryer is your gi’s worst enemy
- Wash after every session to kill bacteria — but wash it right
Why BJJ Gis Shrink
Cotton fibers tighten under heat. That’s it — no mystery. When you wash or dry hot, those fibers contract permanently and the fabric locks in a smaller shape.
A pearl-weave gi that fits you today can drop a full size after one hot-water cycle. Stylso gis are cut from pre-shrunk pearl weave, but “pre-shrunk” doesn’t mean “heat-proof.” It means they’ve already gone through one controlled shrink pass — you don’t get a second free one.
Here’s a lesson from judo worth carrying into your BJJ training: judogis are single-weave cotton, which actually shrinks faster in hot water than BJJ pearl weave. Same cotton fibers, less protective structure. Whether you’re training BJJ, judo, or both, the rule is the same: cold wash is safe, hot wash is not.
The 4-Step Wash Without Shrinking
- Turn it inside out. Protects the outer weave texture and prevents colour fading. If you’ve got patches or embroidery, this keeps them clean and intact too.
- Wash cold — 30°C / 86°F max. Set the machine to a cold or delicate cycle. Don’t trust “warm” — gi fabric doesn’t need the extra heat, and warm water is the first step toward a tighter fit. If your machine only shows a cold option, that’s exactly the one you want.
- Use a gentle sport or enzyme detergent. Enzyme cleaners (like Sport Wash or similar) break down sweat and bacteria without attacking cotton fibers. Add half a cup of white vinegar to the rinse cycle — it neutralises odours without chemicals and rinses out completely.
- Air-dry flat or hang in the shade. Lay it flat on a clean surface or hang it indoors or in the shade. Never tumble-dry — even a low-heat cycle adds up session by session. Avoid baking in direct noon sun for hours too; UV degrades colour and weakens fibers over time.
Wash Method Safety Comparison
Not sure which setting to use? Here’s the quick reference:
| Method | Shrink Risk | Odour Kill | Fabric Life |
|---|---|---|---|
| Machine — cold, gentle cycle | ✓ Low | ✓ Good | ✓ Long |
| Machine — warm (40°C) | ⚠ Medium | ✓ Good | ⚠ Medium |
| Machine — hot (60°C+) | ✗ High | ✓ High | ✗ Short |
| Hand wash — cold | ✓ Low | ⚠ Fair | ✓ Long |
| Tumble-dry — any heat | ✗ Very High | N/A | ✗ Short |
| Air-dry (flat or hang) | ✓ Low | N/A | ✓ Long |
Which Detergent to Use
You don’t need a specialist product — a standard enzyme-based sport wash works well. Look for:
- No bleach — bleach destroys cotton fibers and weakens weave integrity over time
- Enzyme formula — breaks down sweat proteins that cause smell (Sport Wash and similar cleaners fit this)
- Low-suds — machine rinse cycles clear these more thoroughly, preventing residue buildup
Skip fabric softener. It coats cotton fibers and kills the gi’s natural moisture-wicking ability — the opposite of what you want during hard rounds.
Free: BJJ Gi Care Checklist
A one-page printable — the 4-step no-shrink wash routine, quick-reference safety chart, and 5 common mistakes to avoid. Get it instantly.
Drying Without Shrinking
Two rules to live by:
- Don’t leave it bunched up wet. Spread it flat or hang it immediately after the wash cycle ends. A damp gi left in a heap smells within a few hours — and takes twice as long to dry.
- Shade or indoors is fine. You don’t need direct sun. Good airflow dries a gi faster than intense heat, and without the UV damage to colour.
A competitive tip from the judo world: judokas who compete at weigh-ins take gi care seriously because a shrunken judogi with sleeves too short can fail equipment inspection. The same principle applies in BJJ under IBJJF rules — your gi has to meet sleeve and trouser length requirements. Keep it the right size, and it’s one less thing to stress the morning of a tournament.
How Often Should You Wash Your Gi?
After every single session. Always. A gi holds sweat, skin cells, and bacteria from everyone you rolled with. Skin infections like ringworm and staph spread on unwashed gear — and they don’t just affect you. They spread to your training partners, your coach, the kids’ class that uses the same mats.
If you train twice in one day and a full wash isn’t possible between sessions, a cold rinse-through and a hang-dry buys you time. Don’t ball it up in your bag overnight — that’s how you get a gi that smells like a problem and an infection you didn’t plan for.
Common Mistakes
- Washing hot “just once” — cotton fiber damage is permanent. There’s no going back.
- Tumble-drying on low — any heat level adds up over weeks and months.
- Using bleach on stains — weakens stitching and cotton thread progressively.
- Skipping washes after light sessions — bacteria don’t care how hard you worked. They grow either way.
- Soaking for hours — extended soaking loosens stitching seams over time, especially at the collar and cuffs.
What If Your Gi Already Shrank?
Some shrinkage can be partially reversed. Wet the gi thoroughly in cold water, then gently stretch it while damp and lay it flat to air-dry in the stretched position. Place light weights on the edges or stand on the lapels briefly — careful, not hard. It’s not guaranteed, but it can recover a centimeter or two.
A full size change — like A2 down to A1 — usually can’t be fully recovered. If the gi’s too far gone, the Stylso men’s gi is built from pre-shrunk pearl weave and is IBJJF approved across multiple colourways. You don’t restart this cycle with a new one.
Buying for a kid between sizes? The Stylso kids’ gi runs in the K-series — grab the next size up, wash it cold from the first session, and they’ve got room to grow without the shrinkage panic.
Related guides: How to stop a BJJ gi from shrinking · Best BJJ gi for beginners
FAQ
Can I wash my BJJ gi in warm water?
Up to 30°C is safe every time. Warm cycles (40°C) carry medium shrink risk — you might get away with it once or twice, but cold is safer long-term and there’s no benefit to the extra heat for a gi wash.
How do I remove blood stains from a gi?
Cold water only — hot water sets protein stains permanently. Pre-treat the spot with cold water and an enzyme detergent, let it sit for five minutes, then wash cold as usual. Hydrogen peroxide (3%) works on white gis; test on a hidden seam area first.
Will my gi shrink if I just air-dry it?
No. Air-drying (flat or hanging) causes essentially zero shrinkage. The heat from a dryer drum or a hot wash cycle is what does it — not the drying itself.
Can I tumble-dry on a no-heat / air-only setting?
You can, occasionally. Air-only tumble drying carries much less shrink risk than heat, but it still causes more mechanical wear on the weave than laying flat. Save it for emergencies — it’s not a regular routine.
How do I get gi smell out without harsh chemicals?
Half a cup of white vinegar in the rinse cycle, or a sport-specific enzyme wash. Both neutralise the bacteria causing the odour. Dry with good airflow — a stuffy room or a damp bag keeps the smell coming back.
My gi shrank — will cold washes stop it shrinking more?
Yes. Cold washes won’t cause further shrinkage. The damage from past hot cycles is set, but switching to cold now stops the pattern. Check our full guide on how to stop a gi from shrinking for the prevention routine.
