You've signed up for your first class, you're excited to get on the mat — and then someone mentions you'll need a gi. Suddenly you're staring at dozens of options online with no idea where to start. Don't worry: choosing your first martial arts gi is simpler than it looks once you understand a few key factors.
- Not all gis are the same — judo, BJJ, and karate gis differ in cut, fabric, and durability.
- Fabric weight (measured in GSM) affects comfort, durability, and suitability for competition.
- Sizing varies between brands, so always check each manufacturer's size chart before buying.
- For most beginners, a mid-range single-weave gi offers a good balance of quality and value.
What Is a Gi and Why Does It Matter?
A gi (also called a kimono in Brazilian jiu-jitsu) is the traditional uniform worn in many martial arts, including judo, Brazilian jiu-jitsu (BJJ), karate, and aikido. It typically consists of a heavy jacket, drawstring trousers, and a belt. The uniform isn't just ceremonial — in grappling arts especially, the gi is actively used during training, with practitioners gripping the collar, sleeves, and lapels.
Because the gi takes a significant amount of physical stress, the quality of its construction matters. A poorly made gi can tear during training, shrink unevenly, or become uncomfortable quickly. Investing a little time in choosing the right one can make your early training experience much more enjoyable.
Judo Gi vs Jiu Jitsu Gi: What's the Difference?
One of the most common points of confusion for beginners is understanding that gis are not interchangeable across disciplines. The judo gi vs jiu jitsu gi distinction is particularly important, and getting the wrong one for your art can create problems on the mat.
A judo gi is typically made from a thicker, stiffer cotton weave. The jacket has a wider cut and shorter skirt, which suits judo's throwing-focused movements. The sleeves and trousers are also cut with a looser fit to allow for large range-of-motion throws. Judo gis are built to withstand the intense grip fighting common in the sport.
A BJJ gi, by contrast, tends to have a slimmer, more tapered cut. The jacket skirt is longer, the collar is thicker and more reinforced (to resist choke attempts), and the trousers often feature a tighter leg cut. BJJ regulations also allow more variety in colour and design compared to judo's traditional white or blue requirement.
- Karate gi: Lightweight, looser weave — not suitable for grappling arts.
- Judo gi: Heavy, stiff weave — wider cut for throwing range of motion.
- BJJ gi: Medium-to-heavy weave — slimmer cut, reinforced collar, longer skirt.
- Aikido gi: Similar to judo but often lighter weight.
Always check with your instructor before purchasing, as many schools have specific requirements about which gi style and colour is permitted in class.
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Understanding Gi Fabric Weight (GSM)
GSM (grams per square metre) is the standard measure of fabric density used in gi manufacturing. It's one of the most useful numbers to understand when shopping, and it directly affects how your gi feels and performs.
Generally speaking, gis fall into three broad categories by weave and weight:
- Single weave (around 350–550 GSM): Lighter, more breathable, and easier to dry. A good option for hot climates or beginners who train frequently and need quick wash-and-dry turnaround. Tends to be less durable over time.
- Double weave (around 650–1000 GSM): Very thick and durable, much harder for training partners to grip. Can feel quite heavy and hot, especially in warmer gyms.
- Pearl weave / Gold weave (mid-range): A popular middle ground — reasonably durable, lighter than a double weave, and comfortable for most training environments. Many beginners find this the most practical starting point.
For most beginners, a pearl weave gi in the 450–550 GSM range is often recommended by instructors as a solid all-round choice. That said, if your gym is particularly warm, a lighter single weave may suit you better — it's worth asking more experienced students at your school what they prefer.
How to Use a Gi Size Guide
Getting the right fit is arguably the most important part of choosing a gi, and it's also where many beginners go wrong. Unlike regular clothing, gi sizing varies significantly between brands — an A2 from one manufacturer may fit very differently to an A2 from another. This is why a gi size guide from the specific brand you're considering is essential reading before you order.
Most brands use a letter-number system for adult sizing (A0–A6 for adults, M0–M4 for children) or a numeric system. When consulting a size chart, you'll typically need to know your:
- Height
- Weight
- Chest measurement
- Hip/waist measurement (for trousers)
It's also important to account for shrinkage. Most cotton gis will shrink after the first wash — some brands pre-shrink their gis, but many do not. If you're between sizes, check whether the brand recommends sizing up or down, and always wash your new gi in cold water on the first wash to minimise unexpected shrinkage.
If possible, try on a gi at a martial arts retailer before buying online. Many BJJ and judo clubs also keep a small stock of loaners you can try during a trial class, which gives you a feel for sizing before committing to a purchase. Pairing the right gi with a proper stretching routine to improve flexibility and mobility can help you get the most out of your training from day one.
What to Look for in Build Quality
Beyond fabric weight, the construction of a gi tells you a lot about how long it will last. Key quality indicators include reinforced stitching at stress points (collar, armpit seams, knee patches on trousers), the thickness and firmness of the collar, and the quality of the drawstring system on the trousers.
Look out for these specific details when evaluating a gi:
- Double or triple stitching at high-stress seams (collar, shoulders, crotch)
- Ripstop panels on trouser knees for added durability
- A rope drawstring (rather than flat elastic) for a more secure trouser fit
- Collar firmness — a well-structured collar holds its shape and is harder for opponents to grip
Cheaper gis may look similar to premium options at first glance, but often cut corners on stitching and collar construction. For a beginner, you don't need to spend a fortune, but it's generally worth avoiding the very cheapest options, which may not survive the rigours of regular training.
Budget: How Much Should You Spend?
Gi prices range from under £30 to well over £150 for premium competition-grade options. For a beginner, spending at the higher end is rarely necessary. A mid-range gi in the £50–£90 range typically offers good durability and comfort without the premium price tag of competition-focused brands.
Some martial arts schools sell branded gis directly, which can be a convenient starting point — you'll know it meets the school's requirements, and you may be able to try it on before buying. As your training progresses and you develop stronger preferences, you'll have a much better sense of what features matter most to you. Just as it pays to start running gradually as a beginner before investing in specialist gear, many experienced practitioners recommend starting with a budget-to-mid-range gi before upgrading.
Practical Tips: How to Get Started
- Ask your instructor first. Before buying anything, confirm what colour, style, and brand requirements your school has. Some schools require white gis; others allow blue or black.
- Know your art. Make sure you're buying the right type of gi — a BJJ gi for BJJ, a judo gi for judo. Using the wrong style can affect your training and may not be permitted in class.
- Measure yourself carefully. Use a tape measure to record your height, weight, and chest/hip measurements, then cross-reference with the specific brand's size chart.
- Account for shrinkage. Wash your new gi in cold water the first time and air dry where possible to manage shrinkage.
- Start mid-range. For your first gi, a pearl weave option in the £50–£90 range is often recommended by instructors as a practical starting point.
- Check return policies. If ordering online, confirm you can return or exchange if the fit isn't right — sizing variation between brands makes returns a common necessity.
- Take care of your gi. Wash it after every session, allow it to dry fully before storing, and it should last you considerably longer. A good gi is an investment in your training.
If you're new to martial arts training, it's also worth reading up on how to prepare your body for the demands of the mat. A consistent morning stretch routine can help support flexibility and reduce the risk of discomfort during early training sessions. And don't underestimate the importance of a proper warm-up and cool-down as part of your regular practice.
Key Takeaways
- Always buy a gi designed for your specific martial art — judo, BJJ, and karate gis are not interchangeable.
- Fabric weight (GSM) affects durability, breathability, and comfort; a pearl weave in the 450–550 GSM range is often a practical beginner choice.
- Sizing varies significantly between brands — always consult the manufacturer's size chart and account for potential shrinkage after washing.
- Mid-range gis (roughly £50–£90) typically offer a good balance of quality and value for beginners.
- When in doubt, ask your instructor — they can advise on school requirements and may have hands-on experience with specific brands.
This article is for informational purposes only and is not a substitute for professional medical advice. Always consult a qualified healthcare provider before making changes to your health routine.