EVENT
2021.08.23 update

UNDERSON UNDERSON , an underwear brand using washi paper, is holding its first pop-up store at the men's department.

09.01 Wed -09.21 Tue
Isetan Shinjuku Men's Building B1F Underwear, socks, and nightwear

UNDERSON UNDERSON , a lifestyle brand with the concept of "Healthy skin created by washi paper," will be holding its first-ever pop-up store Isetan Shinjuku Store, Men's Building . From September 1st (Wed) to September 21st (Tue), the underwear, socks, and nightwear section on the first basement floor Isetan Shinjuku Store, Men's Building will feature a lineup of underwear and loungewear, including boxer shorts.

UNDERSON UNDERSON items utilize "WASHIFABRIC®," a patented material where 99.9% of the parts that touch the skin are made from washi paper. Using washi paper grown in managed Canadian forests and produced and processed with environmental considerations in mind, they offer Japanese underwear that is gentle on both the skin and the environment.


Boxer shorts: 3,960 yen

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The appeal of UNDERSON UNDERSON underwear lies in its comfortable feel throughout all four seasons. Because 99.9% of the part that directly touches the skin is made of washi paper, the "WASHIFABRIC®" absorbs sweat, keeping you feeling dry and comfortable, whether it's the profuse sweating of summer or the dampness of winter when layering clothes. In addition to the inherent functionality of washi paper, it also boasts stretchability.



Boxer shorts ¥3,960 * Exclusive color available only Isetan Shinjuku Store, Men's Building

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This pop-up store will feature not only the brand's signature underwear, but also loungewear, socks, and masks. Among them, the highly popular open-front short boxer shorts will be available in a long-awaited new color. The chic brown color, perfect for autumn and winter, will be exclusively available Isetan Shinjuku Store, Men's Building so be sure to check it out.

These washi paper undergarments become softer and more comfortable against your skin with each wear. We want you to experience the endless possibilities that washi paper offers.

▶View UNDERSON UNDERSON products at Mitsukoshi Isetan Online Store

▶Mitsukoshi Isetan Online Store | Click here for the special feature page on underwear, socks, and nightwear

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Event Information
UNDERSON UNDERSON Pop-up
  • Event period: September 1st (Wed) - September 21st (Tue)
  • Location: Isetan Shinjuku Store, Men's Building B1F (Underwear, Socks, Nightwear)


*Please note that due to various circumstances, the event may be changed or canceled without prior notice.
*Click here for information on business hours.

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Text: ISETAN MEN'S net

＊All prices include tax.
＊The information in this article is current as of the time of publication. Product information may be revised or changed without notice.

For inquiries, please contact Isetan Shinjuku Store, Men's Building , B1F, Underwear, Socks, and Nightwear. Tel: 03-3352-1111 (Main number)
For inquiries via email, please click here.

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