BJJ Rashguard: The complete guide to choosing the right one (and when to wear it)
BJJ Rashguard: It's not just a piece of lycra
If you think the BJJ rashguard is just for aesthetics — a way to look more professional on the mat — you're missing an important part of the equation. A technical rashguard reduces mat abrasions, compresses muscles reducing fatigue, prevents sweat from accumulating on the skin, and — importantly — provides a fundamental hygienic barrier during sparring.
But how do you choose it? Short sleeve or long? Which fabric? When do you wear it under the gi and when standalone in NoGi? Find all the answers below.
Rashguard under Gi vs NoGi: rules and differences
The first fundamental distinction concerns its use:
|
Gi |
NoGi |
|
|---|---|---|
|
Use |
Under the gi jacket (optional in training, forbidden/allowed in competition depending on regulations) |
As the main layer over spats or shorts |
|
Color |
White or black (IBJJF). Free in training |
Matches belt color. IBJJF: white=white, blue=blue, purple/brown/black=black |
|
Sleeves |
Short preferred (less grip under the jacket) |
Long for abrasion protection |
|
Fabric |
Light, not bulky under the gi |
Technical, breathable, stretch-resistant |
Fabrics and features: what to look for before buying
Spandex/Lycra (4-way)
4-way stretch fabric is the standard for BJJ rashguards. It moves in all directions with the body, doesn't restrict grips, and resists repeated stretching well. Look for at least 80% polyester + 20% spandex for a good balance between durability and mobility.
Sublimation vs. heat print
Sublimated designs are embedded in the fabric during manufacturing — they won't peel, crack, or fade, lasting as long as the rashguard itself. Applied heat prints wear out with washing. If you buy a rashguard with elaborate graphics, always check that it is digital sublimation.
Flat-lock seams
Flat-lock seams don't create pressure on contact points with the mat. A raised seam on the hip or shoulder becomes a constant source of discomfort during guard. This is a construction detail that distinguishes professional rashguards from cheaper ones.
Short sleeve or long sleeve: when to use which
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Long sleeve: maximum abrasion protection, ideal for those who often train takedowns, wrestling, or No-Gi on rough mats. Recommended for NoGi competitions where IBJJF rules require it for certain categories.
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Short sleeve: cooler, less bulky under the gi. Ideal for summer months or for those who prefer to feel direct arm contact.
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3/4 sleeves: the increasingly popular intermediate solution. Covers the forearm (the most exposed area to abrasions) without overheating the shoulders.
Spats: the essential complement for NoGi
BJJ spats are compressive leggings made of technical fabric worn under the gi (to protect the legs from shorts abrasions) or as a base layer in NoGi paired with shorts. In addition to their protective function, the muscle compression of spats aids recovery during prolonged sessions.
On TopKimono, you'll find spats in sizes S–XXL, available in men's and women's versions, in colors compliant with IBJJF regulations.
How to wash them: rashguards are not indestructible
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30°C max, delicate cycle: high temperatures degrade elastane.
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No fabric softener: reduces the absorption properties of technical fabric.
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Never tumble dry: heat melts synthetic fibers.
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Turn inside out before washing: protects sublimated prints.
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→ Explore BJJ Rashguards on TopKimono |
Conclusion: the rashguard is a technical investment, not an accessory
Choosing the right BJJ rashguard means choosing fewer abrasions, fewer skin infections, less muscle fatigue, and more freedom of movement on the mat. It's an investment that pays off in every training session.
Whether you're looking for your first rashguard or want to update your kit for the next NoGi competition, on TopKimono you'll find the complete selection with fast delivery throughout Italy.