Which BJJ gi weight should you choose? The question comes up with every purchase, and the answer sits in two figures that product pages sum up in three words: fabric weight and weave. Two Brazilian jiu-jitsu gis can show the same price, the same size and the same colour, and behave in radically different ways after six months on the mat. This guide explains what those two figures actually describe, what they change in training and in competition, and how to use them to choose without getting it wrong.

What fabric weight measures, and what it does not

Fabric weight is expressed in GSM, for grams per square metre, that is the weight of one square metre of the jacket fabric. A gi advertised at 450 GSM uses a cloth in which every square metre weighs 450 grams. It is a measure of fabric density, nothing more.

Three points matter, because they are behind most of the misunderstandings:

• GSM applies to the jacket, not to the whole gi. Pants follow a different unit (see below). A “450 GSM” gi does not weigh 450 grams, it weighs between 1.2 and 1.9 kg depending on the size.
• GSM says nothing about the quality of the cotton or the finishing. A dense cloth that is badly sewn, with a soft collar and single stitching at the cuffs, will wear out before a lighter, well-built one.
• GSM says nothing about the weave. Two 450 GSM jackets woven differently have neither the same feel, nor the same flexibility, nor the same behaviour when an opponent grips the sleeve.

The weight ranges and who they are for

The market has narrowed over the past ten years to a tight band: a BJJ gi weight almost always sits between 350 and 550 GSM. Here is how the uses break down.

Fabric weight	Fabric profile	Who it is for	Limits
350 to 400 GSM	Light, soft from the first wear, dries fast	Competitors watching the weigh-in, training in hot climates, daily sessions with little drying time	Creases more, marks faster at the gripping areas. Note: below 380 GSM, the jacket falls outside IBJJF approval.
400 to 475 GSM	Versatile, this is the current standard	The vast majority of practitioners, two to five sessions a week	A compromise, so outstanding nowhere and good everywhere
475 to 550 GSM	Dense, stiff at first, softens with washing	Intensive practice, heavier builds, practitioners who want a gi that lasts several years	Heavy on the scale, slow to dry, uncomfortable in summer
Above 550 GSM	Very dense, inherited from judo gis	Marginal use in BJJ today	Bulky, expensive, poorly suited to the modern guard game

One counter-intuitive point is worth stating: a heavier gi is not a better gi. A dense cloth stands up better to repeated grips, but it is also harder for you to grip. Many high-level competitors train in 450 GSM and compete in 350 or 380 GSM, for the single reason that they save a few hundred grams on the scale.

The weave: what happens inside the cloth

A fabric is the crossing of two sets of yarns: the warp, running lengthwise, and the weft, running across. The way these yarns interlace defines the weave. That is what gives the fabric its texture, its flexibility and its strength at equal density.

Weave	Construction	Common weight	Behaviour
Pearl weave “rice grain”	Alternating loose and tight wefts, creating small regular bumps on the surface	350 to 550 GSM	The current standard, and by far the most widespread weave on gis sold today. Good balance between weight, flexibility and durability. This is the weave used across the whole ATHOM range.
Single weave	The simplest weave: one weft yarn passes alternately over then under each warp yarn	375 to 500 GSM	Light, soft straight away, inexpensive. Less durable over time under heavy grips. Historically the entry-level gi.
Gold weave	Thick warp yarns alternated with fine ones, producing a ladder-like appearance	550 to 750 GSM	The historic compromise between single and double weave, with a reputation for toughness. Often more prone to shrinking. Now a minority choice since pearl weave became widespread.
Honeycomb “nid d’abeille”	The weft skips several warp yarns, forming a raised hexagonal pattern	Close to gold weave	Very textured feel, high density. Uncommon, mostly found on limited runs.
Double weave	Two warp layers woven together, hence double the thickness	800 GSM and above	Very durable, very heavy. Comes from judo. Almost gone from BJJ: too stiff and too hot for extended ground work.
Diamond weave “losange”	Offset crossings forming a regular diamond pattern on the surface	Variable, often between 400 and 550 GSM	Positioned between single weave and gold weave: denser and more textured than a single, lighter than a gold. The diamond texture offers good grip. A manufacturer-specific name, with no standardised definition.
Crystal weave	A pearl weave variant, with a looser weft and a basket-like appearance	Variable	Softer and loftier feel than a classic pearl weave, easy to grip. Reported to shrink more. Uncommon.
Ripstop	Reinforcement yarns inserted in a grid at regular intervals, stopping a tear from spreading	Very light	Used mainly on pants, rarely on jackets. Excellent strength-to-weight ratio, fast drying.

Watch out for marketing names

Three families are technically well defined: single weave, double weave and pearl weave. The other names (gold, diamond, honeycomb, crystal, and their “plus”, “pro” or “premium” variants) are partly marketing vocabulary. Two brands can use the same name for two different fabrics, and no standard defines what a diamond weave is.

The consequence is simple: the name of the weave alone is not enough to compare two gis. Always look at the pair fabric weight plus weave, and where possible the actual weight of the gi in your size. It is the trio that describes the cloth, not the label.

Why pearl weave won

Pearl weave produces a durable cloth at a moderate fabric weight. That is exactly what modern BJJ is looking for: a gi that holds up to sleeve and collar grips without weighing two kilos. Single weave stayed fragile, gold weave was heavy, double weave made ground fighting a chore. Pearl weave solved all three problems at once, which explains its dominance on the market.

Pants follow a different unit: the ounce

Manufacturers almost never express pants in GSM, but in ounces (oz), a weight-per-square-yard unit inherited from the American textile industry. BJJ pants generally sit between 8 and 12 oz. Two materials share the market:

• Canvas (cotton duck). Tough, dense, a little stiff at first. It is the classic choice for pants that have to take knee pressure on the ground and friction on the mat.
• Ripstop. Clearly lighter for comparable strength, dries faster, less hot. It is the choice of competition gis and of practitioners training in overheated gyms.

One regulatory point worth knowing: for a gi intended for IBJJF competition, the uniform manual requires the pants to be of twill or ripstop construction, within a range of 220 to 300 g/m². The word “canvas” covers different realities depending on the manufacturer, and sometimes refers to a twill. If you are aiming for approval, ask for the exact construction, not the marketing name.

The same model can exist with either material. In the ATHOM range, the 96 Mundial and the Skylar come with 10 oz ripstop pants, while the Iconic, the Defend and the Camo Black V2 come with 10 oz canvas. At identical jacket weight, the pants tip the gi towards the light side or the tough side.

Fabric weight, actual weight and competition weigh-ins

This is where fabric weight stops being an abstraction. In IBJJF competition, the athlete is weighed wearing the gi and the belt. There is only one weigh-in, before the first match, with no tolerance: going over means disqualification, with no change of division and no refund. The exact terms are set out on the official weigh-in page.

It is also the reason a BJJ gi weight is chosen differently depending on whether you are stepping onto a competition mat or stacking up evening training sessions.

Between a 380 GSM gi with ripstop pants and a 550 GSM gi with canvas pants, the weight gap in A2 can exceed 400 grams. In a tight division, that gap alone decides whether you are allowed to compete. Add moisture to that: a dense cotton gi absorbs sweat and gains weight over the course of a competition day.

What the IBJJF actually checks

This is the most misunderstood part of the subject. You often read that the federation does not care about fabric weight. That is wrong: the uniform manual for manufacturers sets precise limits, on both fabric weight and weave type.

Item	Jacket	Pants
Permitted fabric weight	380 to 650 g/m²	220 to 300 g/m²
Composition	100% cellulosic fibre (cotton, hemp, bamboo, eucalyptus), or at least 90% cellulosic fibre and at most 10% synthetic	100% cellulosic fibre, or at least 55% cellulosic and at most 45% synthetic
Construction	Braided embossed fabric required. Canvas and twill constructions are refused.	Twill or ripstop required
Colours	White, royal blue or black. Navy blue is expressly refused. Jacket and pants in the same colour, with no detail in a different colour.

The measurements taken at the pre-match check come on top of these material requirements:

Item	Rule
Collar thickness	Between 1 and 1.3 cm
Collar width	Between 4.5 and 5 cm
Jacket length	Must reach down to the thigh
Sleeve length	No more than 2 cm from the wrist, arm extended horizontally
Sleeve opening	7 cm minimum along the whole length
Pant length	No more than 2 cm above the ankle bone
Pant leg opening	7 cm minimum, measured from the knee down

Two practical lessons. First, a gi under 380 GSM cannot be approved, which sets a floor on the weight-saving game in competition. Second, the construction requirement explains the dominance of pearl weave: it is a braided embossed fabric, so compliant by nature, whereas a canvas jacket is refused whatever its fabric weight.

The full detail, patches, reinforcements, labelling and belt, is covered in our IBJJF rules guide. These figures come from the uniform manual for manufacturers, published by the IBJJF. Check the version in force before a competition, the document changes.

Pre-shrunk: the figure nobody looks at

Cotton shrinks. A gi that has not been through a pre-shrinking treatment can lose several centimetres on the sleeves and on jacket length from the very first washes, which is enough to push a sleeve past the 2 cm limit at the wrist.

A pre-shrunk gi has been washed and dried at the factory before cutting. It still moves a little, but within controlled limits. Dense weaves such as gold weave are reported to shrink more than pearl weave, but the treatment matters more than the weave itself.

Three rules are enough to limit the phenomenon: cold wash (30 °C maximum), air drying, never a tumble dryer. The rest is detailed in our gi care guide.

Which BJJ gi weight for your profile

You are starting out

Aim for 400 to 450 GSM in pearl weave, with canvas pants. It is the most forgiving setup: flexible enough not to get in the way, tough enough to take a year of learning. Do not pay for a high fabric weight you have no use for yet. Our first gi guide covers the subject from scratch.

You train three to five times a week

Two 450 GSM gis beat a single 550 GSM one. Rotating them allows full drying between sessions, which extends the life of the fabric far more effectively than a higher fabric weight.

You compete

An approved gi in 380 to 400 GSM, with ripstop pants, kept for competition. Below 380 GSM, IBJJF approval is no longer possible. You gain on the weigh-in and on moisture absorption. Keep your heavier training gi for everyday sessions.

You train in a hot gym

Go down in fabric weight and favour ripstop for the pants. Thermal comfort and drying time matter more than theoretical durability.

Which BJJ gi weight in the ATHOM range

All our gis use a pearl weave and pre-shrunk cotton. What sets them apart is the jacket fabric weight and the pants material.

Model	Jacket	Pants	Profile	Approval
Skylar	380 GSM pearl weave	10 oz ripstop	Light, built for competition and the weigh-in	IBJJF and CFJJB
Camo Black V2	420 GSM pearl weave	10 oz canvas	Intermediate, daily training	NOT IBJJF
96 Mundial	450 GSM pearl weave	10 oz ripstop	Versatile, lightened by the ripstop pants	IBJJF and CFJJB
Iconic	450 GSM pearl weave	10 oz canvas	Versatile and tough, intensive training	IBJJF and CFJJB
Defend	450 GSM pearl weave	10 oz canvas	Versatile and tough	IBJJF and CFJJB

The exact weight of the gi, size by size, is shown on every product page. That is the figure to check before entering a competition.

Frequently asked questions

Is a 450 GSM gi better than a 350 GSM gi?

No, it is different. The 450 GSM stands up better to repeated grips and lasts longer in intensive training. The 350 GSM weighs less at the weigh-in, dries faster and stays comfortable in a hot gym. The right fabric weight depends on your practice, not on a quality ranking.

Does the IBJJF set a minimum fabric weight?

Yes. The IBJJF uniform manual sets jacket fabric weight between 380 and 650 g/m², and pants between 220 and 300 g/m². It also requires a braided embossed fabric for the jacket (canvas and twill are refused), twill or ripstop for the pants, a composition mainly of cellulosic fibre, and one of the three permitted colours: white, royal blue or black.

What is the difference between pearl weave and gold weave?

Pearl weave alternates loose and tight wefts, creating small rice-grain bumps, at a moderate fabric weight. Gold weave alternates thick warp yarns with fine ones, giving a ladder-like appearance and a heavier fabric, generally above 550 GSM. Pearl weave took over because it offers comparable durability for a clearly lower weight.

What is diamond weave?

It is a weave whose offset crossings form a diamond pattern visible on the surface. It sits between single weave and gold weave: denser than a single, lighter than a gold, with a texture that offers good grip. Be aware that the name is not standardised: two manufacturers can use “diamond weave” for two different fabrics. Compare the fabric weight and the actual weight of the gi rather than the weave name alone.

Is ripstop less durable than canvas?

No, it is durable in a different way. Ripstop includes reinforcement yarns in a grid that stop a tear from spreading. At equal weight, it holds up very well. Canvas offers better abrasion resistance, which matters for knee pressure on the ground. Ripstop is lighter and dries faster.

Will my gi shrink?

Pre-shrunk cotton still moves slightly over the first few washes, but within controlled limits. Wash cold, air dry and never use a tumble dryer. The expected shrinkage figure is given model by model on our product pages.

Which BJJ gi weight for a beginner?

Between 400 and 450 GSM in pearl weave. It is the most versatile setup: flexible enough for a beginner, durable enough to last a full year of training.

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