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Contact information


Your email address is the only way we can get back to you, please double-check for typos!

Tell us more about you


This is very important if you want an accurate answer.


E.g.: Aikikai, Iwama-ryu, Yoshinkan, etc. This will help us targeting specific needs.


If we already know your dojo, we can compare past orders, check translations (dojo name) etc.

What are you contacting us about ?


Height and weight are mandatory. Hips and chest circumference are not, but allow us to be more precise.


Please don't modify this field

In order to answer as fast as possible (usually within 24h), please answer directly the last email you received form us concerning this order. In all cases, please be as precise as possible, this will help us to handle your request the best way possible.

Order modification?

Did you check the cancellation policy?
If yes, please answer the order confirmation email with your request.

Want to know when your order will be shipped/delivered?

Did you check the shipping estimation date in the order confirmation email?
If yes, please answer the order confirmation email

Problem with your order tracking and/or delivery?

Did you check our information page about order tracking?
We actually deliver 80% of all orders ahead of schedule, and our staff is ready to contact you asap if anything comes up with the production of the ordered item.
If yes, please answer the shipping confirmation email with your request.

Problem with received goods (damaged/wrong product)?

Did you check our information page about damaged packages or product delivery errors?
If yes, please answer the shipping confirmation email.
Don't forget to attach all required elements and detail your case as precisely as possible.

Any other question?

Please answer the last email you received from us regarding this particular order.

Store information

We are open from Monday to Friday, 10 am to 6 pm (Japan Time / UTC+9).
We are closed on weekends and Japanese national holidays as well as a few days mid-August for O'bon and a few days around new year.

Phone number: +81 (0)4-8437-1740
(please request assistance in English or Japanese to be redirected to the corresponding support staff)

Address: 351-0101 Saitama-Ken, Wako-shi, Shirako 2-27-51 - Japan (Access map)
Although we don’t have a brick and mortar shop, we welcome all our guests wishing to meet us with great pleasure at our office. However, it is imperative to contact us in advance to arrange an appointment if you would like to make any purchase. This is to make sure that international staff is available to provide advice and hence, to take care of you the best way possible.

Who's behind the keyboard? Meet our international support staff

Jordy Delage

Jordy, Seido's founder, will answer some general questions and take care of most of the claims.
Want to get to know him ?
Check his presentation!

Rahel Bunzli

Rahel, our general manager, will answer general questions and all technical questions about clothing.
Want to get to know her ?
Check her presentation!

Fouad Belouadheh

Fouad, the IT guy, will answer questions related to the website.
Want to get to know him ?
Check his presentation!

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