How to Choose Your First BJJ Gi: Weight, Weave and Fit Guide

Choosing a BJJ gi comes down to three things: weave weight, size, and whether you need IBJJF compliance. A lighter weave (350gsm to 400gsm) is cooler and easier to move in. A heavier weave (450gsm and above) lasts longer and holds up to competition gripping. Size is more specific in BJJ than most martial arts and getting it right from the first purchase saves you from buying twice. This guide covers all three, plus what to look for as a beginner buying their first gi in Australia.

In this guide

• What is GSM and which weave weight should you choose?
• How BJJ gi sizing works
• Will my gi shrink after washing?
• Do you need an IBJJF-approved gi?
• What to buy as a beginner
• FAQ

What Is GSM and Which Weave Weight Should You Choose?

GSM stands for grams per square metre and measures the density of the gi fabric. Most BJJ gis fall between 350gsm and 550gsm. Here is how to think about the range:

For most Australian students training in indoor gyms, a 420 to 450gsm pearl weave hits the right balance of breathability and durability. Pearl weave is also the most common construction at competition level.

How Does BJJ Gi Sizing Work?

BJJ gis use a letter-number system (A0, A1, A2, A3, A4, A5) that combines height and weight. This is different from most martial arts uniforms. Use this as a starting guide:

• A0: under 60kg, up to 165cm
• A1: 60 to 70kg, 165 to 175cm
• A2: 70 to 80kg, 170 to 180cm
• A3: 80 to 90kg, 178 to 188cm
• A4: 90 to 100kg, 185cm and above
• A5: over 100kg or very tall builds

If you are between sizes, size up and wash in cold water to control shrinkage. Check the specific size chart on each product page before buying, as brands cut their gis differently.

Will a BJJ Gi Shrink After Washing?

Yes. Most pearl weave gis will shrink 5 to 10 percent after the first wash if washed warm or hot. Cold water washing and air drying is the safest approach for maintaining size. If you buy a gi that fits perfectly fresh out of the bag and then machine wash it hot, it will likely be too small after the first wash. Wash cold, air dry, and re-evaluate fit before assuming a size is wrong.

Do You Need an IBJJF-Approved Gi?

Only if you are competing in IBJJF-sanctioned tournaments. IBJJF approval means the gi meets specific standards for colour (white, royal blue, or black only), weave density, collar thickness, and sleeve/pant length. If you are training at a club without competition plans, any well-made BJJ gi works. If you are entering IBJJF events in Australia, you need a gi that explicitly meets their specification to avoid disqualification at check-in.

What Should a Beginner Buy as Their First BJJ Gi?

Buy a well-made training gi in white or blue, in the right size, and do not overspend on your first purchase. At the beginning of BJJ you are still figuring out whether you enjoy rolling in a gi at all. Spending $200 on a premium gi before you know you are committed is a common mistake. A solid $89 training gi gives you everything you need for the first 12 to 18 months.

Frequently Asked Questions

How often should I wash my BJJ gi?

After every session. A gi worn twice without washing degrades faster (sweat breaks down the fibres) and creates hygiene problems for your training partners. Most gyms have rules requiring clean gis at every session. Wash in cold water, air dry, and your gi will last significantly longer.

Can I train BJJ without a gi?

Yes. No-gi BJJ (usually in shorts and a rash guard) is a popular format and is offered by most Australian BJJ gyms alongside gi classes. Many students train both. Whether to start with gi or no-gi is a personal preference, though most coaches recommend beginners start with the gi as it slows the pace and teaches gripping and technique more clearly.

What colour BJJ gi should I buy?

White or blue for a first gi. Both are universally accepted at clubs and competitions. Black gis are also common at club level but check your gym's preferences before buying. Coloured gis (grey, green, etc.) may not be allowed at IBJJF events.

Is a heavier gi better for BJJ?

Not necessarily. A heavier weave lasts longer and can be harder to grip, but it is also warmer and less comfortable in Australian summer training. A mid-weight (420 to 450gsm) gi is the best balance for year-round Australian training.