TENTIAL's Next Material Challenge: Silk – Introducing 'BAKUNE Premium Silk'

TENTIAL Inc. (headquartered in Shinagawa-ku, Tokyo; CEO: Yutaro Nakanishi, hereinafter 'TENTIAL'), a company committed to realizing a health-forward society through its conditioning brand 'TENTIAL,' announces the launch of 'BAKUNE Premium Silk,' its first silk-material product in the BAKUNE series of fatigue-recovery pajamas, which has surpassed cumulative sales of 2 million sets※1. The product will be available starting Tuesday, June 16, 2026, via TENTIAL’s official online store and official stores nationwide. This garment transforms natural silk into recovery wear through Japanese craftsmanship and TENTIAL’s product development philosophy.

TENTIAL’s mission is to 'create a society that proactively embraces health and unlock human potential.' The company believes that human potential depends not only on ability but also on optimal physical and mental condition. However, maintaining good condition is often still perceived as something special. Therefore, TENTIAL reimagines everyday life scenes from a conditioning perspective, aiming to make maintaining condition an 'everyday norm' through scientifically grounded products and R&D.

Sleep is an essential human activity, and pajamas are one of the garments in longest contact with the skin each day. For this reason, TENTIAL redefines pajamas as a starting point for conditioning. Since comfort and tactile sensation vary from person to person, BAKUNE has developed over 15 different materials to date, all launched as general medical devices. TENTIAL’s approach is not to build products around available materials, but to reverse-engineer the ideal conditioning experience to identify the optimal material. This philosophy has driven cumulative sales beyond 2 million sets (4 million individual garments)※1, earning strong customer support.

Silk, the material TENTIAL now challenges, is renowned for its excellent texture and functionality but is also extremely delicate and difficult to handle. Transforming it into viable recovery wear was no easy task. TENTIAL tackled this challenge by collaborating with Japan’s finest manufacturing partners. From fabric production to sewing and packaging, every step is completed domestically with top-tier suppliers. By using finer-than-usual threads in the sewing process, the product preserves silk’s naturally smooth hand feel. Domestic craftsmanship ensures high quality throughout the delicate manufacturing process.

Silk that stretches. Silk that’s washable.

'BAKUNE Premium Silk' contains 76% natural silk, offering superior moisture absorption, release, and breathability to reduce clamminess inside clothing during summer. Additionally, the special functional fiber 'SELFLAME®' reflects far-infrared rays emitted by the body to promote blood circulation and support fatigue recovery. The entire process—from fabric production to sewing and packaging—is manufactured domestically. The use of finer threads ensures the smooth, delicate touch unique to silk fabric.

【Product Features】

1. Stretchable Silk Without Satin Weave

Most silk pajamas use satin weave, but this product achieves flexible stretchability in silk without relying on satin. It moves naturally with the body during sleep. Using knit fabric development, it retains silk’s signature luster while ensuring comfort during nighttime movements.

2. Machine-Washable Silk for Everyday Wear

Silk is typically a delicate fabric requiring hand washing. Through material composition and construction innovations, this product can be washed in a home washing machine when placed in a laundry net. It liberates silk from being 'an outfit for special occasions' to 'an everyday companion,' integrating it into daily life.

Toward Conditioning-Centric Product Development Beyond Material Constraints

BAKUNE Premium Silk comes in a limited-edition gift box. With its luxurious feel and Japanese craftsmanship, it makes an ideal gift for someone special.

TENTIAL is not a brand bound to any single material. It is a brand that seeks, develops, and shapes the best materials for the purpose of conditioning. Moving forward, TENTIAL will continue enhancing its product and service lineup as a conditioning brand, pursuing both scientifically backed functionality and the kind of comfort that makes people want to wear it every day, free from material constraints.

※1 2 million sets: calculated as 1 set = 1 top + 1 bottom (4 million individual garments sold), cumulative sales as of December 2025

BAKUNE Premium Silk (General Medical Device)

Contains 76% natural silk. The highly breathable and moisture-regulating fabric reduces internal garment dampness in summer. The special functional fiber 'SELFLAME®' reflects body-emitted far-infrared rays to promote blood circulation and support fatigue recovery.

Furthermore, the entire process—from fabric production to sewing and packaging—is domestically integrated. Finer-than-standard threads are used to achieve the smooth, delicate hand feel of silk fabric.

【Product Specifications】

Product Name: BAKUNE Premium Silk Set (Top & Bottom)

Medical Device Notification Number: 13B2X10608000022

Colors: Champagne Gold, Platinum

Sizes: S, M, L, XL

Material: 76% Silk, 24% Nylon

Price (incl. tax): (Long Sleeves Crew Neck) ¥29,700 / (Long Pants) ¥29,700

Release Date: June 16 (Tuesday)

Sales Locations: TENTIAL official website, major EC sites, select retail stores, etc.

※Sales status at individual stores can be confirmed via the official EC site.

※Sales status at individual stores can be confirmed via the official EC site.

[TENTIAL Official EC Site] https://tential.jp/products/sleep-bakune-silk-26ss-long-set

About TENTIAL Inc.

TENTIAL Inc. operates the conditioning brand 'TENTIAL' under the mission of 'creating a health-forward society and unlocking human potential.' CEO Yutaro Nakanishi, inspired by his high school dream of becoming a professional soccer player cut short by illness, realized that health and daily conditioning are essential to maximizing one’s potential. This experience led him to found TENTIAL Inc., aiming to 'implement conditioning' into everyday life.

The conditioning brand 'TENTIAL' delivers functional products and services based on athlete insights, cutting-edge technology, and research. It promotes conditioning activities that support physical and mental recovery and performance enhancement across all daily life scenarios, 24/7, 365 days a year. Everything begins with personal condition