What Should You Wear Under Your BJJ Gi?

Starting Brazilian Jiu-Jitsu (BJJ) can be both exciting and intimidating. As a beginner, one of the first questions you’ll encounter might be surprisingly simple: What do I wear under my gi?

The right under-gi clothing can significantly affect your comfort, performance, and even hygiene on the mats. In this guide, we’ll walk you through all the options, considerations, and common pitfalls to help you feel confident and prepared for your first (or next) class.

Why Does It Matter What You Wear Under Your Gi?

Choosing the right under-gi attire is more important than you might think. Here’s why:

1. Comfort and Mobility

BJJ involves constant movement, tight holds, and rolling on the mats. Ill-fitting or unsuitable clothing can restrict your range of motion, cause discomfort, or even distract you during training.

2. Hygiene

BJJ is a close-contact sport, so maintaining good hygiene is critical. Proper under-gi clothing helps wick away sweat, reducing odors and minimizing bacterial buildup.

3. Skin Protection

The mats and your training partners’ gis can cause friction and mat burns. Wearing the right layers provides a barrier that reduces skin irritation.

The Basics: Common Options for Under-Gi Wear

When it comes to under-gi clothing, you have several options to choose from. Each choice offers its own benefits and caters to different preferences.

1. Rash Guards

Rash guards are one of the most popular under-gi options for BJJ practitioners. Here’s why:

• Moisture-Wicking: They pull sweat away from your skin, keeping you dry and comfortable.
• Skin Protection: Prevents mat burns and friction with your gi.
• Compression Benefits: Supports muscles, improving circulation and reducing fatigue.

Pro Tip: Choose a snug-fitting rash guard made of durable, stretchy materials like polyester or spandex. You can pick between short-sleeve or long-sleeve options depending on your preference.

2. Compression Pants or Spats

Compression pants (commonly called spats) are an excellent choice for wearing under gi pants.

Benefits:

• Adds an extra layer to prevent chafing.
• Helps regulate body temperature during intense training.
• Protects your legs from mat burns or skin irritation.

Pro Tip: Like rash guards, look for moisture-wicking and anti-microbial fabrics to keep you comfortable and hygienic.

3. Sports Bras (for Women)

For women, a well-fitted sports bra is essential. BJJ involves a lot of rolling, inverting, and physical exertion, so you’ll need proper support to stay focused and comfortable.

What to Look For:

• High-impact bras for maximum support.
• Breathable fabrics like nylon or spandex.
• Seamless designs to avoid discomfort under your gi jacket.

4. Athletic Shorts or Leggings

Athletic shorts or leggings can work under your gi as well. They’re a versatile and affordable option for beginners.

Things to Avoid:

• Avoid shorts or leggings with zippers, buttons, or loose material that could snag or get caught during rolling.
• Make sure they’re snug enough to stay in place during dynamic movements.

5. Traditional Cotton T-Shirts

Some beginners opt for plain cotton T-shirts, but these are not ideal for long-term use.

Pros:

• Cheap and easy to find.
• Acceptable for casual or trial classes.

Cons:

• Absorbs sweat, leaving you feeling damp and heavy.
• Can cause chafing during extended training.

Factors to Consider When Choosing Under-Gi Clothing

Selecting the best under-gi wear depends on your personal preferences and training environment. Here are key factors to keep in mind:

1. Material

• Opt for breathable and moisture-wicking fabrics like polyester, spandex, or nylon blends.
• Look for anti-microbial properties to combat odor and bacteria.

2. Fit

• Snug-fitting clothes reduce friction and stay in place during grappling.
• Avoid overly tight options that restrict your movement or breathing.

3. Hygiene

• Always wear freshly laundered under-gi clothing to maintain gym hygiene standards.
• Anti-microbial gear helps prevent skin infections like ringworm or staph.

4. Gym Etiquette

• Some gyms have dress codes or preferences (e.g., requiring rash guards).
• Check with your instructor or gym policies before your first class.

What Should You Avoid Wearing?

Not all clothing is suitable for BJJ training. Avoid these common mistakes:

1. Zippers, Buttons, or Hard Materials

• These can scratch your training partners or damage your gi and mats.
• Stick to smooth, minimalistic designs.

2. Loose-Fitting Clothes

• Baggy clothing can bunch up, get tangled, or even be grabbed during training.
• Opt for form-fitting gear for optimal performance and safety.

3. Non-Athletic Materials

• Avoid heavy cotton or fabrics that absorb sweat and become uncomfortable.
• Invest in athletic wear specifically designed for high-intensity activities.

Additional Tips for Beginners

Starting strong with the right gear will make your BJJ journey smoother. Here are some additional tips:

1. Layer Wisely

• If you train in a colder climate, consider wearing thermal rash guards or spats under your gi.
• In hot weather, opt for lightweight, breathable options to stay cool.

2. Invest in Quality Gear

• High-quality rash guards and spats may cost more upfront but will last longer and provide better performance.
• Look for trusted BJJ brands like Ground Force or Fuji for reliable options.

3. Pack Extras

• Always bring a backup rash guard or spats in case your primary set gets soaked or damaged.
• Carry a towel and deodorant for quick refreshes during long training sessions.

FAQs About Under-Gi Clothing

1. Do I have to wear a rash guard?

While not mandatory in all gyms, rash guards are highly recommended for their comfort, hygiene, and protective benefits.

2. Can I train in just a sports bra and gi pants?

This depends on your gym’s culture and rules. Many gyms require a full top layer for hygiene and modesty.

3. What’s the best option for hot weather training?

Short-sleeve rash guards and spats made from lightweight, moisture-wicking materials are ideal for hot conditions.

Conclusion

Choosing the right under-gi clothing can make a world of difference in your BJJ experience. From rash guards to compression pants, selecting gear that fits well, feels comfortable, and supports your movements is essential for beginners and experienced practitioners alike.

Final Tips:

• Don’t hesitate to experiment with different combinations to find what works best for you.
• Prioritize cleanliness and hygiene to keep yourself and your training partners safe.

To have a look at our "under-gi" assortment, please select 'No Gi' in our main menu. Here you find the subcategories Rashguards and Spats.

This guide covers everything you need to know about under-gi clothing, ensuring that your first steps on the mats are confident and comfortable. See you on the mats!