Karate Gi K-400 Classic


  • Free Shipping Deals
  • Premium Customer Service
  • Unbeatable Japanese Quality
  • This was Mas Oyama's karate uniform for many years.
  • The K-400 is one of our most popular Karate Gis and an all-time classic.
  • You can mix sizes for a perfect fit and even order jacket or pants only.

This is the exact same dogi worn by the legendary Masutatsu "Mas" Oyama, the founder of Kyokushin. Nowadays this is the gi that new Kyokushin students traditionally receive when they join a dojo in Japan. It has the perfect cut for all styles of Full Contact Karate. You can move and strike freely, and hear the gi snap when you throw fast combinations.


  • Hard training
  • Men, women and kids
  • New students

Please note that sizes 0-3 come with an elastic waistband, whereas larger sizes feature the traditional drawstring. If you are looking for a quality unbleached full contact karate gi at an affordable price, then this is the right model for you. However, if you want a premium custom made uniform, then it might be worth it to spend a few extra dollars and upgrade to the Isami K-500 Mas Oyama.

The jacket of this ivory color Gi (unbleached) is made of 100% cotton canvas. The pants are made of 100% cotton twill. The fabric is Japanese and the uniform is assembled in Vietnam. The stitch lines are reinforced for combat and will never break. Buy with confidence! 


  • Check our detailed size chart and compare our numbers to your best fitting dogi.
  • You can order jacket and pants in different sizes for a perfect fit.
  • You can also order jacket only or pants only.
  • This gi is not pre-shrunk so it will reach the stated dimensions after 2-4 wash cycles. 

Isami Karate Gi K-400 Sizes

Customer Reviews

Based on 11 reviews Write a review

We want to make it as easy as possible for you to order the gear you need here at ChokeSports.com. That's why we created thresholds depending on where in the world you are...

  • Asia: Free Shipping starts at $100
  • USA, Canada, Europe, Oceania: Free Shipping starts at $150
  • All other countries: Free Shipping starts at $200

Even if your order does not qualify for the free shipping deal, you'll still get great shipping rates starting at only $19.95. During checkout you will have the option to upgrade to Express Delivery for only $7.50 (recommended).

How long does delivery take?
Express Shipping time is only 3-5 work days - sometimes faster! - but not guaranteed. Standard Shipping is 5-10 work days. Our average processing time is 2-5 work days as some items are stored in different warehouses. We process and dispatch orders on regular business days (Mon-Fri) except for national holidays in Japan.

Do you deliver anywhere in the world?
Yes! Here at ChokeSports.com we can ship orders from Japan to virtually any address in the world. As a matter of fact, we have regular customers all across the globe and ship worldwide on a daily basis.

Where are you based?
We pack and ship your order directly from our main warehouse in Saitama, Japan.

Can I track my order?
Yes! After we dispatch your order you will receive automatic delivery updates via email and sms. You can also track the order directly in our site.

Do you offer insurance?
Yes! All orders already include full insurance (even though we have never lost a package in almost 10 years). Shop with confidence!

Are import taxes included in the price?
No. You pay us only for merchandise + shipping. ChokeSports.com orders are shipped from Japan with duties and taxes unpaid. All customs, duties, taxes and brokerage fees have not been pre-paid and you are responsible for paying these at the time of delivery (if there are any). We recommend you contact the local tax authority in your area to find out in advance exactly what taxes need to be paid.

What Customers Are Saying About Chokesports

I'm always happy to open the package to discover another new obi belt. The quality is still the best, delivery time still there, and most important the service is no 1. I had communication with Lisa Andersen. She wanted to be sure that my order was the right one for my new Shodan young girl. Very dedicated to the client. Simply the best.

Ghislain F. Quebec, Canada

I've always had my eye on RVDDW and Isami brand gear but wasn't sure about how to order in the US. ChokeSports made the process extremely easy and the shipping was amazingly fast even including the time allotted for custom patchwork. Extreme recommend to anyone on the fence. Much respect always to ChokeSports.

Brandon M. Tennessee, USA

Best gi from best vendor. This is my third Isami Gi purchase from ChokeSports. I use them for Judo and BJJ. They fit the best, and they feel the best. Super fast shipping too. Rest assured I will order my fourth Isami Gi from ChokeSports in the future.

Dennis K. Texas, USA

I want to congratulate the whole company, not only for the excellent work with the black belt I bought, but mainly for the support I had from the first steps of ordering. Connor's help was valuable through the chat line, up to the emails informing me of every detail. My colleagues and I will recommend your company. Thank you!

Nikolaos G. Athens, Greece

Where you’ve seen us