BJJ Gi Guides
Practical, no-fluff guides written from the factory floor. After years of producing countless Gis, rash guards, and academy kits, we share what we actually know about fabric, fit, and IBJJF rules — so academies and athletes can make better choices.
BJJ Gi Fabric Weights: 380 vs 450 vs 500 GSM
What GSM actually means, and how 380, 450, and 500 GSM pearl weave compare on feel, durability, climate, and IBJJF legality — plus which weight to pick for your training.
- Who it's for
- Academy owners and buyers specifying a first custom run, and athletes deciding what to train in.
- The decision it helps you make
- Which of the 3 weights to put on your order form. Read it before you request a quote — fabric weight is the single line that most changes how a Gi feels, what it costs, and how long it lasts.
Start a BJJ Academy Risk-Free: The Gimakx Partnership
How new academy owners start with just 10 custom Gis, a free logo-and-colour mockup, and no contracts — plus a 30-day local promotion program to help enrol your first students.
- Who it's for
- New and growing academy owners who want branded Gis but cannot commit to a large first order.
- The decision it helps you make
- Whether to move from unbranded Gis to your own. It sets out the 4 steps, the 10-unit minimum, the 3–4 week production window, and the 30-day promotion, so you can judge the commitment before you contact anyone.
BJJ Gi Size Chart: A0–A4, W1–W4, K0–K4
Full height-by-weight charts for men's, women's and kids' Gis, plus what to do if you fall between two sizes and how much a pre-shrunk Gi actually shrinks.
- Who it's for
- Anyone building a size spread — an academy splitting 10 units across a class, or a single athlete ordering one Gi.
- The decision it helps you make
- Which sizes to put on the order, and what to do when height and weight disagree. Covers all 3 charts, the 1–3% shrinkage figure, and the between-sizes rule.
Next Guide In Progress
Another manufacturer's guide is on the way. Check back shortly, or contact us directly if there's a topic you'd like us to cover.
Publishing soonNot sure where to start? Read them in order, first to last — the sequence runs from the basics to the more advanced. Fabric weights and the size chart between them cover everything a written quotation needs from you; the partnership guide then explains how a first academy order actually works.
Frequently Asked Questions
Which BJJ Gi guide should I read first?
Read them in the order they appear on the guides page, first to last. The sequence is deliberate: it opens with the basics and moves to more advanced topics further down. Start with fabric weights, then work through the list. If you only need one specific answer, jump straight to the guide that covers it.
What GSM should a beginner's Gi be?
450 GSM for adult beginners and 380 GSM for kids. 450 GSM is heavy enough to take daily grip-fighting while you build technique, and it is the most ordered weight we make. 380 GSM is lighter and more breathable, which suits children and hot training rooms. The fabric weights guide compares all three weights in full.
How do I know which Gi size to order for my academy?
Size by your students' height and weight together, then order 3 to 4 units per size to cover the spread of a typical class. Because the minimum is 10 units per design and sizes can be mixed freely within that design, a first order of 10 usually lands as 3 or 4 units across two or three adjacent sizes. The size chart has the full height-by-weight tables.
Who writes these guides?
They are written by Sara Ahmed, Content Creator at Gimakx, working from the production floor rather than from other websites. Gimakx is the manufacturer, not a reseller, so the numbers in these guides — GSM weights, shrinkage percentages, minimum order quantities, lead times — are the figures we actually produce to.
Do I need to read a guide before requesting a quote?
No. You can request a quote without any of this and we will walk you through the options. The guides exist so you can arrive at that conversation already knowing which fabric weight and which size spread you want, which usually shortens it to a single exchange.
Can you write a guide on a topic that is not here?
Yes — tell us the topic. These 3 guides cover the questions academies ask us most often, and the list grows in the order that buyers actually ask. If there is something you needed to know and could not find here, send us the question and it goes on the list.