Do You Need a Rash Guard for No-Gi BJJ?

by Adrian Davis April 14, 2025

Yes, wearing a rash guard for No-Gi Brazilian Jiu-Jitsu (BJJ) is highly recommended and often required. In No-Gi BJJ, practitioners typically wear a rash guard and shorts instead of the traditional Gi. Here’s why a rash guard is essential for No-Gi training:

1. Protection Against Mat Burns and Scratches:

No-Gi training involves a lot of friction between your skin and the mats, which can lead to painful mat burns and skin irritation.
A rash guard provides a protective layer that minimizes abrasions and friction burns.

2. Reducing the Risk of Skin Infections:

BJJ mats can harbor bacteria, fungi, and viruses that can lead to infections like ringworm, staph, and impetigo.
Rash guards help create a barrier between your skin and potential contaminants, reducing the risk of infection.

3. Hygiene and Sweat Management:

No-Gi training is fast-paced and sweat-intensive. Rash guards are designed to wick away sweat, keeping your body dry and reducing the buildup of bacteria.
Training without a rash guard can lead to excessive sweat transfer between training partners, which is less hygienic.

4. Compression Benefits:

Rash guards provide mild compression, which can help improve blood circulation, reduce muscle fatigue, and aid in recovery.
Compression can also provide support to muscles and joints during intense training sessions.

5. Grip Control and Slippage:

Rash guards are designed to be tight-fitting and smooth, making it harder for your opponent to grip and control your body.
Without a rash guard, your opponent can use your bare skin as a grip point, potentially limiting your movement.

6. Compliance with Competition Rules:

Most No-Gi BJJ competitions, such as those under the International Brazilian Jiu-Jitsu Federation (IBJJF), require competitors to wear a ranked rash guard (matching their belt level).
Even in non-competitive settings, many gyms and academies have rules that mandate wearing a rash guard for hygiene and safety.

Can You Train No-Gi Without a Rash Guard?

While some gyms may allow training in tank tops or t-shirts, it’s generally discouraged due to hygiene and safety reasons.
Training in loose clothing can also lead to fabric bunching, discomfort, and potential injuries.

Conclusion:

A rash guard is not just a recommended piece of gear for No-Gi BJJ—it's a practical and often required part of training attire. It protects your skin, maintains hygiene, and enhances performance, making it a crucial investment for anyone serious about BJJ.