If you're shopping for a karate gi, the options can feel overwhelming fast. Cotton or polycotton? 8oz or 14oz? Single or double weave? These aren't just marketing differences. They affect how you move, how you feel after two hours of training, and how long the gi actually holds up. Here's what actually matters when you're picking a karate gi, and how to get years of use out of it.
What the weight of a gi actually means
Gi weight is measured in ounces per square metre of fabric. Lighter gis, around 6oz to 8oz, are cooler, move freely, and dry fast. They suit kata competition, hot training environments, and younger athletes still building their fitness base. Heavier gis, from 12oz to 16oz, are denser, hold their shape better, and have a satisfying snap when you execute a clean technique. Most serious practitioners training kumite or traditional kata favour something in the 10oz to 14oz range.
Training in a Queensland or Western Australian summer is its own challenge. A 14oz gi will have you drenched inside 20 minutes in a non-airconditioned dojo. If heat is a factor, go lighter and wash more often.
Single weave vs. double weave
Single weave gis are lighter and more affordable. The fabric is woven once, which makes it breathable and easier to move in. Most beginners start here, and plenty of experienced practitioners train in single weave their whole career.
Double weave gis are heavier and stiffer. The jacket is noticeably thicker and harder to grip, which matters in styles that involve grabbing. They last longer under heavy use but take longer to dry and feel restrictive in warm conditions. If your training includes a lot of grappling or partner drills where grips are used, double weave holds up better.
For most karateka training three to five sessions per week, a mid-weight single weave in the 10oz to 12oz range hits the right balance.
Cotton vs. poly-cotton blends
100% cotton gis feel better against the skin, breathe well, and look sharp when pressed. The trade-off is shrinkage. A cotton gi needs to be washed in cold water and line dried, or it'll shrink up to two sizes after a few washes.
Poly-cotton blends resist shrinkage better and dry faster, which is useful if you train multiple days in a row and don't have time to wait for a full dry. The feel is slightly stiffer and less natural, but many athletes don't notice after the first few sessions.
If you compete, check your association's rules. Some governing bodies specify minimum cotton content or prohibit certain blends.
Getting the fit right
Karate gis are sized differently from standard clothing. Most brands use a numerical sizing system based on height, not weight or chest measurement. A size 3 typically suits someone around 160cm to 170cm, a size 4 runs from 170cm to 180cm, and so on, but this varies by brand.
Sleeves should sit about 5cm above the wrist. Jacket length should cover the hips with room to move without bunching. Pants should fall to mid-shin or just above the ankle. If you're between sizes, size up for the jacket and adjust the drawstring on the pants.
Account for shrinkage on cotton gis. If a cotton gi fits perfectly out of the bag, it's probably already one wash away from being too small.
What to look for in the stitching
Stitching is where cheap gis fail. Check the stress points: collar reinforcement, sleeve attachment, crotch seam, and belt loops. Double or triple stitching at these points is the difference between a gi that lasts 12 months and one that lasts five years.
Collar construction matters too. A well-stitched, reinforced collar holds its shape after washing and doesn't fray or curl. If the collar is thin and poorly finished from the start, it won't improve with use.
How to wash and care for your gi
Wash in cold water, always. Hot water breaks down cotton fibres faster and accelerates shrinkage. Turn the gi inside out before washing to protect the outer surface and reduce pilling.
Line dry in the shade rather than direct sunlight. UV exposure degrades cotton over time and causes white gis to yellow. If you need to machine dry, use a low heat setting and pull it out while slightly damp.
Don't leave a wet gi in your bag. Bacteria and mildew set in quickly, and once a gi smells, it's very hard to fully remove. Air it out after every session, even if you're not washing it.
Iron on a medium heat setting if you want a clean, sharp look for competition. Starch lightly if the rules in your association require a more formal presentation.
Belts and what they need
Your belt takes more punishment than the gi in some ways. It's tied and untied hundreds of times, dragged across the floor, and absorbed into every clinch and fall drill. A quality belt has dense, tightly woven fabric that holds its shape and doesn't fray at the ends after a few months.
Some practitioners avoid washing their belt based on tradition. If you do wash it, cold water and air dry only. The dye in coloured belts can run, so wash separately.
Buying advice
Know your style first. WKF-approved gis for competition have specific standards around colour, fit, and construction that differ from a traditional dojo training gi. If you're buying for competition, check the approved list for your governing body before purchasing.
Buy from a supplier who understands the gear. FitSet is Australian-owned and supplies direct to athletes, so there's no overseas wait and the range is put together by people who train, not just buyers working from a product catalogue.
The Morgan Karate Uniform is a practical starting point for club training. It's built from a durable cotton blend, sits in the mid-weight range that suits most training environments, and holds up well through regular washing cycles. For athletes moving into competition or high-volume training, stepping up to a heavier single weave with reinforced stitching at the stress points is worth the extra spend.
Don't buy the cheapest gi you can find. A gi that falls apart in six months costs more over a year than a decent mid-range option bought once.
Conclusion
Pick the right weight for your training environment and style, check the stitching before you buy, wash it cold, and dry it in the shade. A well-chosen karate gi, cared for properly, will last years of consistent training. Browse the FitSet martial arts uniforms collection to find the right gi for your level and training load.
What size karate gi should I buy? ||| Gi sizing is based on height, not clothing size. Check the brand's specific size chart before ordering, and if you're between sizes on a cotton gi, size up to account for shrinkage after washing. @@@How often should I wash my karate gi? ||| Wash it after every session if possible, or at minimum every second session. Always use cold water and line dry in the shade to preserve the fabric and prevent yellowing. @@@What is the best gi weight for competition karate? ||| Most WKF competitors use gis in the 8oz to 12oz range for kata and kumite. Lighter gis allow faster movement, but check your association's rules as some events specify minimum fabric weights or approved brands. @@@Can I use a karate gi for other martial arts? ||| A karate gi can work for other striking arts, but it won't suit judo or Brazilian jiu-jitsu, where grips and pulling on the jacket are part of the sport. The lighter construction isn't built to handle that kind of stress. @@@