Washing your gi correctly is the single biggest factor in how long it lasts and whether it develops that permanent funk that no amount of detergent can fix. The rules are simple, but most people break at least one of them.
The Basic Rules
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Wash after every single session. Not every other session. Every time. Bacteria starts growing immediately in the warm, damp fabric. This is non-negotiable for hygiene and for the lifespan of the gi.
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Cold water only. Hot water shrinks gis and breaks down the fabric faster. Use cold water for every wash. If your gi is too big and you want it to shrink slightly, one warm wash can help, but this is a one-way trip.
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Hang dry. Never tumble dry a gi. The heat will shrink it unpredictably and weaken the fabric over time. Hang it on a line, a drying rack, or over a door. Direct sunlight helps kill bacteria and can lighten stains on white gis.
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Don’t leave it in your bag. The single worst thing you can do to a gi is roll it up wet and leave it in your gym bag for hours (or overnight). The smell that develops is nearly impossible to remove completely.
Detergent and Additives
Regular laundry detergent works fine. You don’t need specialty gi soap or martial arts detergent. Use whatever you normally use for your clothes.
White vinegar is the best additive for gi care. Add half a cup to the wash cycle. It kills bacteria, neutralizes odors, and softens the fabric without damaging it. It won’t make your gi smell like vinegar once it’s dry.
Baking soda helps with stubborn odors. Add a quarter cup to the wash along with your detergent. Good for gis that have started to develop that “permanent mat smell.”
Avoid bleach on colored gis. It will fade them unevenly. For white gis, occasional bleach is fine but not necessary if you’re washing after every session.
Avoid fabric softener. It coats the fibers and can actually trap bacteria, making the smell problem worse over time. It also reduces the fabric’s ability to absorb moisture.
Dealing with Stains
Blood stains are a fact of life in BJJ. The key is to treat them before they set:
- Cold water immediately. Run cold water over blood stains as soon as possible. Hot water sets blood stains permanently.
- Hydrogen peroxide works well on white gis. Dab it on the stain, let it fizz, then wash normally.
- For colored gis, use an enzymatic stain remover or soak in cold water with salt before washing.
Mat stains (the grey-brown marks from the mats) are mostly cosmetic. They fade with regular washing but rarely come out completely. This is normal; it’s a training uniform, not a dress shirt.
Shrinkage: What to Expect
Most gis shrink. How much depends on the fabric, the brand, and how you wash them.
- Cold wash + hang dry: Minimal shrinkage. Maybe 1-2% over the first few washes, then it stabilizes.
- Warm wash + hang dry: Noticeable shrinkage, roughly half a size.
- Hot wash + tumble dry: Up to a full size of shrinkage. This is how people accidentally ruin gis.
- Pre-shrunk gis (Sanabul, Elite Sports, some Fuji models): Very little shrinkage regardless of wash method. What you buy is what you get.
If your gi is slightly too big, you can shrink it intentionally with a warm wash. But go slowly; you can always shrink more, but you can’t un-shrink.
How Often to Replace Your Gi
A well-maintained gi from a reputable brand should last 1-3 years of regular training (3-4 sessions per week). Signs it’s time to replace:
- Fabric is thinning and you can see through it when stretched
- Collar has gone soft and doesn’t hold its shape
- Stitching is coming apart at stress points (armpits, knee area, lapel seams)
- The smell won’t go away no matter what you do
- It no longer passes gi check at competitions (sleeves too short, fabric too thin)
Rotating between two or more gis doubles the lifespan of each one, because each gi gets time to fully dry between sessions. If you train 3+ times a week, owning at least two gis is worth the investment.
Quick Reference
| Do | Don’t |
|---|---|
| Wash after every session | Leave it in your bag overnight |
| Use cold water | Use hot water (unless intentionally shrinking) |
| Hang dry | Tumble dry |
| Add white vinegar for odor | Use fabric softener |
| Treat blood stains with cold water immediately | Use hot water on blood stains |
| Rotate multiple gis | Train in the same gi every day without drying |
About the Author
Andrew Buck
Andrew is the founder of Find Your Gi. A BJJ brown belt and MMA & Jiu Jitsu coach with over 12 years in combat sports, he also brings a decade of experience writing health and fitness content online.