How to Wash a BJJ Gi (Without Shrinking or Ruining It)

Quick answer: Wash your BJJ gi after every single session in cold water on a normal cycle, then hang it to air-dry. Cold water and air-drying prevent shrinkage; washing immediately prevents the bacteria and smell that cause skin infections. Avoid hot water, the dryer, and bleach — all three damage the gi or shrink it.

A BJJ gi soaks up sweat from you and everyone you roll with, so washing it properly isn't optional — it's hygiene that protects you and your training partners from ringworm and staph. Do it right and a good gi lasts for years; do it wrong and you'll shrink it, yellow it, or give it a funk that never washes out. Here's the complete routine.

Wash it after every single session

Never let a sweaty gi sit balled up in your gym bag overnight. A warm, damp gi is a perfect home for bacteria, and that's exactly how a gi develops the permanent sour smell that no amount of washing can fully remove. Wash it the same day, every time. If you can't wash it immediately, at least hang it up to dry so it isn't stewing in your bag.

Use cold water

Cold water — your machine's cold setting, roughly 30°C / 85°F — cleans a gi perfectly well while protecting it from its number-one enemy: shrinkage. Hot water shrinks cotton, and a heavily shrunk gi can end up too short in the sleeves and pants to be comfortable or competition-legal. Cold also preserves the color and the patches.

Air-dry — skip the dryer

The dryer's heat is what shrinks gis the most, far more than washing. Hang your gi to air-dry on a sturdy hanger or a drying rack. Avoid leaving it in harsh direct sun for hours at a time, which can yellow a white gi and slowly weaken the fibers. Air-drying takes longer, but it's the single biggest thing you can do to keep a gi fitting right and lasting for years. If you train often, two gis in rotation solves the drying-time problem.

Killing odor and bacteria

For smell and sanitation, a few simple habits go a long way:

• Wash promptly and don't overload the machine — the gi needs room to actually agitate clean.

• Add about a half-cup of white vinegar to the wash for stubborn odor. It neutralizes smell and helps strip built-up residue without damaging fabric.

• For extra sanitation, a gi-safe disinfectant or a few drops of tea tree oil can help, especially during ringworm season.

• Skip heavy fabric softeners — they leave a residue that reduces the cotton's absorbency and can trap odor over time.

Don't use bleach

It's tempting on a white gi, but bleach weakens cotton fibers, accelerates wear, and can actually turn a gi yellow over time as it breaks down the fabric. If your white gi is dingy, a gentle oxygen-based brightener or the vinegar trick is far safer than chlorine bleach.

Drying faster and storing

If your gi is slow to dry, wring it gently (don't twist hard), hang it where air circulates, and consider a fan. Once it's bone-dry, store it somewhere ventilated — never fold a slightly-damp gi into a drawer, or you'll reintroduce the smell you just removed.

Caring for your belt

You don't need to wash your belt often — a rinse and air-dry now and then is plenty. And no, washing your belt doesn't "wash away your knowledge." That's just a fun gym superstition, not laundry advice.

When to replace a gi

A well-cared-for gi lasts years, but the signs it's time to retire one are thinning fabric at the knees and seat, ripped seams that keep reopening, or a smell that survives proper washing. Rotating two gis roughly doubles the lifespan of each.

The takeaway

Wash your gi in cold water after every session and hang it to dry. That one routine prevents shrinkage, kills the bacteria that cause skin infections, and keeps your gi white, strong, and lasting for years. Avoid hot water, the dryer, and bleach, and use white vinegar for stubborn odor. Need your first gi? See our BJJ gear for beginners guide.

Train somewhere with clean mats

Find a BJJ gym near you → — mat hygiene is one of the biggest things to check when choosing a gym, since skin infections spread on dirty mats, not just dirty gis.

FAQ

Can I put my BJJ gi in the dryer? It's best not to — the dryer's heat is the main cause of shrinkage. Air-dry whenever possible. If you absolutely must use a dryer, use the lowest or no-heat setting and pull it out slightly damp to finish on a hanger.

Why does my gi smell even after washing? Usually because it sat sweaty too long, was overloaded in the machine, or didn't fully dry before being stored. Wash promptly, add white vinegar, don't overload, and make sure it's bone-dry.

How often should I wash my gi? After every single training session, without exception. A gi worn even once carries sweat and bacteria from everyone you rolled with.

Will my white gi turn yellow? It can, from bleach, sweat left too long, or hours of harsh sun. Wash promptly, skip bleach, and dry in the shade or indoors to keep whites white.