Washed your rashguard once and it came out stiff, faded, or two sizes smaller? You’re not alone.
Most rashguard damage happens in the laundry, not on the mat. Heat shrinks spandex. Fabric softener clogs the moisture-wicking fibres. One cycle in the dryer can shorten a rashguard’s life by months. The fix takes about fifteen seconds of thought before you hit Start.
Short answer: Turn it inside out. Cold water, gentle cycle, mild liquid detergent. Never use the dryer. Air dry flat or on a hanger. That’s it — that’s the whole system.
Here’s the full breakdown and why each step matters.
Why Rashguard Fabric Needs Different Care
A rashguard isn’t cotton. It’s a spandex-polyester blend — usually 80–90% polyester with 10–20% spandex. That combo gives you four-way stretch for hip escapes, UV protection for beach training, and the compression that keeps your arms from being grabbed in no-gi. It also makes the fabric heat-sensitive in a way a gi isn’t.
- Heat shrinks spandex. Dryer heat breaks the elastic fibres over time. A few sessions on medium heat can take a torso-length down half a size permanently.
- Hot water fades sublimation prints. The dye that holds rashguard colours bonds best below 30°C (86°F). Push it higher and you’re slowly stripping the design.
- Fabric softener coats the fibres. It blocks the moisture-wicking channels that pull sweat away from your skin. Your rashguard holds heat and odour instead of releasing it — the opposite of what you paid for.
You bought it to move and breathe. These three things kill both. Here’s what to do instead.
How to Wash a Rashguard: Step-by-Step
Step 1 — Turn it inside out. The outside takes the mat friction. Protect it in the wash. Inside out, every single time, no exceptions.
Step 2 — Cold water only. Set your machine to the coldest cycle. Delicates or Hand Wash is even better. No warm, no hot — ever.
Step 3 — Gentle cycle, half a dose of mild liquid detergent. High spin cycles distort the seams over months. Powder detergent leaves residue in synthetic fibres. A small squeeze of liquid is all you need.
Step 4 — Remove immediately. Don’t leave it sitting wet in the drum. Pull it out as soon as the cycle ends.
Step 5 — Air dry flat or on a wide hanger. No direct sunlight — UV fades prints even when cold. A rashguard dries in 2–4 hours indoors. Overnight on a hanger is fine.
That’s five steps. Less than a minute of extra thought per wash.
Machine Wash vs. Hand Wash: Which Is Better?
Both work. Here’s when to choose each:
| Machine Wash | Hand Wash | |
|---|---|---|
| Best for | Weekly post-training routine | Travel, sensitive prints, or a quick rinse |
| Cycle / Method | Gentle / Delicates, low spin | 3–5 minute gentle soak and rinse |
| Temperature | Cold, ≤30°C / 86°F | Cold or very slightly lukewarm |
| Detergent | Half-dose mild liquid | Small squeeze mild liquid |
| Result | Good — consistent | Excellent — most gentle |
If you train daily and wash after every session, machine-washing on delicates is completely fine. The cold water and low spin matter far more than machine vs. hands.
What to Avoid (The Big Mistakes)
The dryer — every time, no exceptions. Even “low heat” cycles build damage over time. Air dry only.
Fabric softener. It ruins the moisture-wicking finish. Your rashguard will smell worse after a few washes. Drop it completely.
Bleach. Destroys elasticity within two or three washes. If odour is the problem, try a splash of white vinegar in the rinse cycle instead — it neutralises bacteria without touching the fibres.
Washing with denim or zipped gear. Rough weave and metal hardware act like sandpaper on spandex. Wash rashguards with other soft training gear.
Leaving it wet in your gym bag. This is how bacteria and mold grow in the seams. Rinse or wash within a few hours of training. If you can’t wash it yet, at least air it out flat.
The Stylso Rashguard Care Stack
Drying: How to Do It Right
Skip the tumble dryer entirely. Even the delicates setting applies more heat than spandex fibres can handle consistently over time.
The fastest air-dry method:
- Press (don’t wring) to squeeze out excess water.
- Lay flat on a clean towel for 10 minutes to pull out more moisture.
- Move to a wide hanger or drying rack — wide hangers prevent shoulder dimples.
- Dry away from direct sun or heat vents.
Most rashguards are dry in 2–4 hours in normal indoor air. If you train in the morning, it’s ready for your evening session. Overnight is fine too.
The Rule Wrestlers Learned First: Wash After Every Roll
Wrestling rooms have had this figured out for decades. Skin-to-mat and skin-to-skin contact spreads staph, ringworm, and other mat infections faster than almost any other sport. Your rashguard is the barrier — but only if it’s clean.
The standard in most college wrestling rooms: no rewear without a wash. Same rule applies in BJJ, whether you’re training no-gi or using a rashguard under your gi. A quick cold-water rinse right after class — even if you can’t do a full wash until later — drops the bacterial load before it multiplies.
Clean gear isn’t just about how it smells. It’s mat safety for you and the people you train with.
If your current rashguard isn’t staying fresh or you’re looking to replace one that’s lost its stretch, check what’s available on Amazon for BJJ-specific fits:
Shop Men’s BJJ Rashguards on Amazon
Free: BJJ Gear Care Checklist
A one-page printable — rashguard and gi wash rules, quick-reference settings table, and the four stops that ruin gear. Get it instantly.
Rashguard FAQ
Can I wash a rashguard in warm water?
Cold is always safer. Warm water won’t destroy it in one wash, but repeated warm cycles break down the spandex fibres faster and fade the sublimation print over time. Stick to cold — there’s no benefit to going warmer.
How often should I wash my rashguard?
After every session. Even when you feel dry, sweat and bacteria are in the fabric. Washing after each roll keeps it hygienic and extends the material’s life. If you can’t do a full wash, rinse it cold within a few hours.
Can I put a rashguard in the dryer?
No. The dryer’s heat breaks down spandex elasticity. Air dry only — it takes 2–4 hours indoors and doesn’t need any heat to dry fully.
Why does my rashguard smell after washing?
Fabric softener residue, or bacteria in the seams from air-drying too slowly. Drop the softener completely, add a splash of white vinegar to the rinse cycle, and make sure the rashguard dries fully within four hours of washing.
Do I need a special sports detergent?
Not required — any mild liquid detergent works. Sports detergents like Hex or WIN break down sweat compounds slightly better, but a gentle all-purpose liquid does the job if you’re using cold water and the right amount. Don’t use powder — it leaves residue in synthetic fibres.
Can I wash a rashguard with other clothes?
Yes, as long as you avoid rough fabrics like denim or anything with metal zips or velcro. Those act like sandpaper on spandex. Wash rashguards with other soft training gear — shorts, spats, or a gentle-cycle gi.
Key Takeaways
- Cold water, inside out, gentle cycle — these three rules prevent most rashguard damage
- No dryer, no fabric softener, no bleach — the three hard stops
- Air dry flat or on a wide hanger, away from direct sunlight
- Wash after every session — it’s mat hygiene, not just a smell fix
- A quick cold rinse right after training buys you time if you can’t do a full wash
Looking for a rashguard that holds its shape through hundreds of washes? Start here:
Shop Stylso BJJ Rashguards on Amazon
