How to Wash a BJJ Gi Without Shrinking It
A step-by-step guide to washing your BJJ gi so it keeps its fit, color, and lifespan instead of shrinking or falling apart.
In this guide
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A good gi isn’t cheap, and most of the damage happens in the laundry room, not on the mats. Heat is the enemy of woven cotton and cotton-blend fabric, and both hot water and a dryer will shrink a gi fast, sometimes a full size in one cycle. Get the washing routine right and your gi will last years of hard rolling instead of months.
This matters even more if you compete or train in a school with strict weight classes and gi-fit rules, since a shrunk jacket or pants that ride up can get you flagged before you even step on the mat. If you’re still deciding between gi and no-gi training, our Gi vs No-Gi BJJ guide covers the gear and cost differences.
Step-by-step
Check the care label first
Every gi brand blends cotton differently, and some ripstop or pearl weave gis have more polyester than others. Look at the manufacturer’s tag before you do anything, since a lighter competition gi may have different care instructions than a heavyweight training gi. When in doubt, treat it as 100% cotton and wash cold.
Turn the gi inside out
This protects the outer weave, embroidery, and any patches from abrasion inside the machine. It also helps sweat and bacteria on the inside of the fabric get more direct contact with detergent and water. Close any velcro on the pants first so it doesn’t snag the jacket.
Use cold water only
Hot and warm water are the single biggest cause of gi shrinkage because heat relaxes and then tightens the cotton fibers as they dry. Set your machine to cold wash, cold rinse, every single time. This one habit does more to protect your fit than any other step on this list.
Wash on a gentle or delicate cycle
Aggressive agitation wears down the weave and stresses the seams and stitching over time, especially around the collar and cuffs. A gentle or delicate cycle is enough to clean sweat and grime out of the fabric without beating up the fibers. If your machine has a “hand wash” setting, that works well too.
Use a mild detergent, skip fabric softener and bleach
A standard mild liquid detergent gets the job done without leaving residue in the fibers. Fabric softener coats cotton and actually reduces its ability to wick sweat, which makes your gi feel damp and smell worse over time. Chlorine bleach weakens cotton fibers and will fade colors and patches, so avoid it completely.
Add white vinegar for odor if needed
If your gi has picked up that stubborn gym funk, add a half cup of white vinegar to the rinse cycle instead of using scented additives. Vinegar helps break down bacteria and residue that plain detergent can miss. It rinses out clean and won’t leave a smell once the gi is dry.
Treat blood or sweat stains before washing
BJJ gis pick up mat burn and the occasional blood stain, and these set permanently if you run them through a hot wash. Dab a stain remover stick or a paste of cold water and mild detergent directly on the spot, let it sit for 10-15 minutes, then wash cold as normal. Never use hot water to pre-treat, since heat sets protein-based stains like blood into the fabric.
Skip the dryer completely
The dryer is where most shrinkage actually happens, even more than the wash cycle. Heat plus tumbling is exactly the combination that tightens cotton weave permanently. Air drying takes longer but is the only reliable way to keep your gi at its original size.
Air dry flat or on a wide hanger
Lay the jacket flat on a drying rack or hang it on a wide, sturdy hanger to keep the shoulders from stretching out of shape. Hang the pants by the waistband so gravity doesn’t pull them out of proportion. A wide hanger matters more than people think, since a thin wire hanger can leave shoulder dimples in a heavyweight gi.
Dry out of direct sunlight
Direct sun fades colors fast, especially on patches, embroidery, and any colored piping. Dry your gi indoors near airflow, or outside in shade, and it’ll keep its color and crispness much longer. A fan or a spot near an open window speeds up drying without any heat damage risk.
Common mistakes to avoid
The biggest mistake is convenience: tossing a sweaty gi straight into a hot wash and dryer because you’re training again tomorrow. That combination shrinks cotton gis reliably and quickly, and it’s very hard to stretch a gi back out once it’s shrunk. If you need a fast turnaround, buy a second gi rather than compromising on wash temperature.
Another common error is using regular detergent with brighteners or bleach alternatives, which can fade colors and degrade patches over several washes. Fabric softener is a sneaky one too, since it seems harmless but actually reduces the breathability and moisture-wicking that makes a gi comfortable during a hard roll. Read detergent labels the same way you’d read a gi’s care tag.
Letting a wet gi sit balled up in a gym bag for hours before washing is also a bad habit. It breeds bacteria, sets in odor, and can even encourage mildew, which is much harder to remove than fresh sweat. Pull your gi out and let it air out, or wash it, as soon as you reasonably can after training.
Tips from the gym
Most experienced practitioners rotate two or three gis specifically so they’re never rushing a wash cycle with hot water just to have a dry gi for the next class. If budget allows, this is genuinely the easiest fix for shrinkage anxiety, since it removes the time pressure entirely.
Washing your gi inside out with any patches also protects embroidery thread from fraying against the machine drum. If a patch starts lifting at the corner, a small amount of fabric glue on the edge before it fully peels off saves a re-stitch later.
New gis, especially 100% cotton pearl weave, tend to shrink a bit in the first one or two washes even with a cold cycle, which some brands actually account for in their sizing. If you bought new and the fit already feels perfect, expect it to tighten slightly after the first wash, which is normal and not a laundry mistake on your part.
Recommended gear
A quality gi holds up to correct washing far better than a bargain one, since the weave and stitching are built for repeated laundering. The BJJ & Grappling hub has more gear guides if you’re building out your kit beyond the gi itself.
Gi vs No-Gi BJJ: Gear, Cost & Which to Start With is worth a read if you’re still deciding which style of training gear to invest in first.
- Hayabusa Ascend BJJ Gi – a durable pearl weave gi built to hold its shape through repeated cold washes.
- Venum Elite BJJ Gi – a lighter competition-style gi with reinforced stitching at high-stress points.
- Woolite Delicates Liquid Detergent – a mild, gentle detergent well suited to woven cotton fabrics like a gi.
- Simple Human Foldable Drying Rack – a sturdy flat-drying option that avoids shoulder stretching from hangers.
For general recovery and gear-care habits between hard training blocks, the Recovery & Conditioning hub has related guides on keeping your gear and body in good shape long term.
Frequently asked questions
Can I wash a BJJ gi in warm water at all?
It’s best to stick with cold water every time, since even warm water can cause gradual shrinkage over repeated washes. Cold water cleans sweat and bacteria out effectively when paired with a good detergent, so there’s little upside to warm water. Save any heat exposure for emergencies only, and expect some shrinkage if you do use it.
How often should I wash my BJJ gi?
Wash your gi after every training session, since sweat and bacteria build up quickly on cotton fabric in close-contact grappling. Letting a damp gi sit unwashed encourages odor and mildew that’s much harder to remove later. If you train multiple times a day, having a second gi lets you wash properly instead of rushing a hot cycle.
My gi already shrunk, can I stretch it back out?
Soaking a shrunk gi in cool water with a small amount of hair conditioner or baby shampoo, then gently stretching it while damp, can sometimes recover a little size, but results are inconsistent. It won’t fully undo significant shrinkage caused by hot water and a dryer. Prevention through cold washing and air drying is far more reliable than trying to reverse the damage.
Is it okay to use bleach on a white gi to keep it bright?
Chlorine bleach weakens cotton fibers over time and can yellow rather than whiten certain fabric blends, so it’s not recommended for a white gi. A better approach is oxygen-based stain removers or a vinegar rinse, combined with prompt washing after sweaty sessions. Sun exposure while drying can also dull whites over time, so dry indoors when possible.
Should I wash the jacket and pants together?
Washing them together is fine as long as you follow the same cold water, gentle cycle approach for both pieces. Just make sure any velcro on the pants is fastened closed so it doesn’t snag the jacket’s fabric or embroidery during the wash. Drying them separately on a flat rack or wide hanger helps both pieces keep their shape.
Why does my gi still smell after washing?
Lingering odor usually means bacteria are trapped deep in the weave, which fabric softener and scented detergents can mask but not actually remove. A vinegar rinse or an enzyme-based sports detergent tends to work better on set-in bacterial odor than standard detergent alone. Make sure the gi is also drying fully between sessions, since a damp gi sitting in a bag is the main cause of persistent smell.
For general laundering guidance on activewear fabrics, the CDC offers hygiene resources relevant to shared training environments like BJJ gyms.
