Sleep Science-Backed Beauty Sleep Brand 'PAJUU' × Women's Exclusive Machine Pilates Studio 'the SILK' Announce First-Ever Collaboration!

CellSource Co., Ltd. [Headquarters: Shibuya-ku, Tokyo; President and CEO: Masayuki Yamakawa] announces a collaborative project with HYV Co., Ltd. [Headquarters: Meguro-ku, Tokyo; Representative Director: Yuichi Koseki], operator of the women-exclusive machine pilates studio 'the SILK (The Silk)', through its evidence-based brand 'PAJUU (Pajuu)' born from sleep research.

On Wednesday, July 22, 2026, a special event combining a workshop and pilates program designed to improve sleep quality will be held at 'the SILK Futako-Tamagawa', and PAJUU products will begin being displayed at 10 'the SILK' studios across Tokyo starting the same day.

Background of the Collaboration

'PAJUU', a Sleep Conditioning Wear brand born from the philosophy that 'accumulating high-quality sleep creates future beauty' and the sleep science concept of 'not overheating', and 'the SILK', which supports women’s mental and physical fulfillment and well-being through pilates, share a strong desire to enhance the health and beauty of modern Japanese women—the most sleep-deprived in the world*1—making this collaboration possible.

By combining pilates, which calms the autonomic nervous system and promotes healthy physical conditions through movement, with PAJUU’s technology—verified through brainwave testing—to support deep sleep (non-REM sleep), this collaboration offers a holistic approach to mental and physical healthcare through both exercise and sleep. It provides a special opportunity for modern women to learn approaches to achieving deeper, higher-quality sleep.

Event Overview: Sleep Beauty-Focused Workshop & Pilates

A one-day-only special event will be held at the SILK Futako-Tamagawa studio. The first half will be a workshop on creating optimal sleep environments and understanding the mechanisms of sleep beauty based on sleep science. The second half will feature a special pilates session designed to enhance relaxation, promote appropriate core body temperature reduction, and guide participants into high-quality sleep.

・Date and Time: July 22, 2026 (Wednesday), 14:00–15:10 (70 minutes)

・Location: the SILK Futako-Tamagawa (2nd floor, Tamagawa River 246, 4-1-9 Tamagawa, Setagaya-ku, Tokyo)

・Program:

Part 1: 'Sleep Beauty Workshop You Can Practice Today' by PAJUU

(Content example: Mechanisms of 'core body temperature' and 'heat dissipation'—key to comfortable sleep; designing a sleep environment to welcome a healthy tomorrow)

Part 2: 'Special Pilates Program to Guide Appropriate Core Body Temperature Reduction and High-Quality Sleep' by the SILK instructors

Target Participants: the SILK members

Participation Benefit: All participants will receive a PAJUU mock-neck T-shirt as a gift

PAJUU Product Display at 10 Tokyo Locations

In conjunction with the event, PAJUU products will be displayed at 10 'the SILK' studio locations across Tokyo starting July 23, 2026. Before and after classes, guests can experience firsthand the smooth, skin-friendly sleepwear made with the proprietary 'REM-tech Fiber™' material.

・Display Period: July 23 (Thursday), 2026 – August 5 (Wednesday), 2026

・Participating Locations (10): Futako-Tamagawa, Hiroo, Meguro, Kagurazaka, Yokohama, Kichijoji, Tamachi, Shinjuku, Akabane, Jiyugaoka

・Display Content: PAJUU Sleep Conditioning Wear

Brand Introduction

【About PAJUU – The Sleep Brand That Enhances Sleep and Beauty】

PAJUU is an evidence-based brand developed by CellSource Co., Ltd., a company with extensive experience in regenerative medicine focused on 'body repair'. Leveraging insights from sleep research, PAJUU focuses on 'core body temperature changes'—a key factor in comfortable sleep—based on sleep science, including brainwave verification. The proprietary 'REM-tech Fiber™' efficiently controls sweat and heat during sleep, supporting deeper non-REM sleep through its Sleep Conditioning Wear.

Official Website: https://pajuu.com

Official Instagram: https://www.instagram.com/pajuu_sleep/

Product Loan Requests: info@presshouse.co.jp

*1 Based on OECD survey

※ This product is not a medical device

※ 'PAJUU' is a trademark of CellSource Co., Ltd.

【About the Women-Exclusive Machine Pilates Studio 'the SILK (The Silk)'】

'the SILK' is a machine pilates studio operating under the concept of 'Change, made part of everyday life.' With 45 locations nationwide and over 20,000 members, it supports the wellness lifestyle of women who 'live with grace.' The studio offers a refined, high-quality space with a white-based aesthetic. Its lessons, which involve moving the specialized 'Reformer' machine to upbeat music, are more than just exercise—they are cherished as a 'luxurious time to deeply reconnect with oneself,' helping women gently restore mind and body after busy days. Currently, a special limited-time campaign is available for first-time visitors to easily experience the benefits of pilates.

Official Website: https://the-silk.co.jp/ Official Instagram: https://www.instagram.com/pilates_thesilk_official/

【About CellSource Co., Ltd.】

CellSource Co., Ltd. promotes the industrialization of regenerative medicine by offering contract processing of adipose-derived stem cells, synovial-derived stem cells, and blood, as well as regulatory compliance support for medical institutions providing regenerative therapies. As a licensed facility under the Act on the Safety of Regenerative Medicine (Facility Number: FA3240004), it has handled over 130,000 cell processing cases. Leveraging its extensive track record, the company strives to provide reliable services to medical institutions and continues research and technological development.

Representative: President and CEO Masayuki Yamakawa

Headquarters: Shibuya Cast 11F, 1-23-21 Shibuya, Shibuya-ku, Tokyo

Business: Regenerative medicine-related services

https://www.cellsource.co.jp/

【Media Inquiries】

CellSource Co., Ltd. Contact: Sato

E-mail: pajuu_press@cellsource.jp