Skip to content
0
Boosts Your Natural Flow
Wellness Tech Wear “Yui”
Advanced Mineral Fabric:
Emits gentle, far-infrared warmth
to enhance natural circulation.
All-Day Comfort:
Designed to harmonize with your body
through long hours and demanding days.
Effortless Self-Care:
Support your resilience
and vitality simply by getting dressed.
First, Love Yourself.
Customer Reviews
Effortless beauty and comfort in one
Whether at home or in the office, you can simply slip it on. You can choose between a V-neck or a round neck to suit your mood, and its lustrous texture pairs perfectly with a jacket. With side pockets, it’s also great for walking the dog. The relaxed fit flatters any body type, and the luxurious mineral-infused fabric gently envelops you in comfort all day long. My personal recommendation is to wear it as a set with the Yui leggings — it’s truly a versatile and convenient piece.
*Fit and comfort may vary by individual.
*Worn item: 2-Way Front and Back Dress, Legging Pants
A premium turtleneck that soothes the soul
I was amazed by the gentle, warming sensation that spreads through my body the moment I put it on. Somehow, I don’t feel irritated when wearing it. The subtle sheen and body-contouring design give it a modern, elegant look that’s perfect even for workwear. I actually wear it as sleepwear too — it helps me sleep deeply and keeps my neck comfortably warm. I’m planning to wear it on my next flight as well. It’s a piece I can’t live without, perfect for year-round comfort even in air-conditioned environments.
*Fit and comfort may vary by individual.
*Worn item: High Neck Top
Aligns your posture — a single piece that enhances circulation through the entire lower body
I’ve suffered from neck and shoulder stiffness for years, but when I work wearing this, I’m amazed at how comfortable it feels. There’s no tightness, and it naturally opens up the chest and aligns my posture — I feel no pain all day long. The circulation-promoting fabric fully covers the lower body, creating an incredible sense of flow throughout. It truly feels like an “innerwear for balance” — one that leaves me feeling calm and centered all day.
*Fit and comfort may vary by individual.
*Worn item: Straight Neck Support & Body Shaping Underdress
Balance your entire body from the ground up
Honestly, I was skeptical about the whole “circulation-promoting” effect — but I was amazed by the gentle warmth and flow I felt the moment I put it on. The lustrous fabric and beautifully designed lines make it perfect for both business and casual days. The side silhouette is truly elegant, and it pairs effortlessly with both heels and sneakers. The warmth that rises gently from the lower body brings comfort throughout the whole body. With its refined elastic waistband and practical pockets, it’s a piece I can’t live without — whether at home or out. Highly recommended even for those who don’t usually like wearing pants.
*Fit and comfort may vary by individual.
*Worn item: Straight Pants, Boat Neck Top
Yui Leggings — Gently enveloping your body into balance
The supportive power net and beautifully designed seam lines make your hips look naturally lifted and shapely, giving a real boost to your confidence. Designed to be worn even under skirts, it offers peace of mind — you can quickly pull it up for coverage when unexpected guests arrive. The circulation-promoting fabric delivers a gentle, cozy warmth from the moment you put it on, making it indispensable for someone like me who tends to get cold easily. Perfect for year-round wear, even in air-conditioned offices. It’s a piece I want to keep wearing — for both workouts and everyday life.
*Fit and comfort may vary by individual.
*Worn item:
Elegant warmth — my everyday essential for work
From the moment I put it on, I can feel a gentle, soothing warmth spreading from where it touches my arms and neckline. Its minimal design makes it perfect as an inner layer under a jacket, and I find myself reaching for it again and again. Unlike typical heat-generating tops, it doesn’t look too casual — the refined details make it elegant enough for work. It’s a truly versatile piece I want to wear even in air-conditioned spaces.
*Fit and comfort may vary by individual.
*Worn item:Boat Neck Top
Yui Collection
5 Reasons to Choose “Yui”
1
Experience Gentle Warmth and Improved Circulation. Powered by Far-Infrared Emitting Fabric
Made with a specially processed fabric infused with multiple natural minerals. It absorbs the body’s thermal energy and re-emits it as far-infrared rays (including terahertz waves), helping to promote blood circulation. This gentle warmth softly envelops the body from within.
* The special fabric used in this product has been verified by the material manufacturer to promote blood circulation through far-infrared radiation.
Smart style with circulation support
2
Wear Your Confidence, From Office to In-Flight
Crafted from Elegant, High-Performance Wellness Tech Fabric
While made with Wellness Tech fabric that helps promote blood circulation, it also features a beautiful, elegant sheen. With its premium material and sophisticated design, it complements any scene and empowers the wearer to shine with confidence and poise.
Shop the Support Wear
Neck care and circulation support
3
Feel light and free
with supportive power net fabric
A powerful yet comfortably flexible power net is built in between the shoulder blades to provide gentle support. It helps improve circulation around the neck and shoulders while encouraging proper posture for those with a forward head position. A special form of care designed to support women living in the tech-driven era.
Discover Posture SupportBody shaping and circulation support
4
Flattering silhouette achieved effortlessly through functional fabric and 3D tailoring
In addition to the special mineral-infused fabric, the body-shaping material and three-dimensional pattern design create a beautifully refined silhouette. The functional, sculpted construction visually streamlines the body’s contours while maintaining comfort, giving a naturally smart and elegant impression the moment you put it on.
Shop the Flattering Fit
5
Premium
“Made in Japan” quality
Only 1% of apparel distributed in Japan is truly “Made in Japan.” Each Yui piece is carefully crafted by skilled artisans with exceptional precision and technique. The result is a garment that offers comfort and confidence every time you wear it, along with lasting durability — the hallmark of Yui’s proud Made in Japan quality.
Promotes circulation around the clock, for any occasion
Not just functional, but elegant — a piece that lets you wear your true self every day.
Smart style
with circulation support
Stay warm up to your neck
with this high-neck top
While made from a “circulation-boosting” fabric, it features a beautiful, subtle sheen. The gathered neckline adds an elegant touch, even when peeking out from a jacket or dress. That’s why it’s perfect as an inner layer for suits — keeping you comfortably warm even in chilly environments.
Shop NowBoat-neck top that flatters your neckline
The boat neckline beautifully frames the décolleté, creating a clean and refined impression around the face. Simple yet elegant, it transitions effortlessly between work and off-duty styles. A smart, figure-enhancing piece you’ll want to add to your everyday wardrobe.
Shop Now
Straight pants that flatter and lengthen your legs
A beautifully tailored straight silhouette that flatters every body shape and fits any occasion. The sleek leg line elongates your figure, even from the side. Featuring a wide elastic waistband for easy wear, and side pockets so you can head out hands-free.
Shop Now2-way dress that works
from office to weekend.
With its 2-way design, you can wear it front-to-back — V-neck or crew neck — to match your mood or occasion. Perfect for both casual and polished looks, this versatile dress expands your styling options with just one piece.
Shop Now
Neck care and
circulation support
Body-shaping underdress
with straight-neck support
Constructed with 24 panels to contour beautifully to the natural curves of a woman’s hips. The built-in power net adds gentle support and creates a visually refined, three-dimensional silhouette. Perfect on its own for lounging or the gym, and also ideal as an inner layer under skirts.
Shop Now
Body shaping
and circulation support
Perfect-shape leg pants
Crafted with 24 panels to contour beautifully to the natural curves of a woman’s hips.Featuring an inner power mesh for a visually sculpted and elegant silhouette.Perfect as a standalone piece for lounging or workouts, and also ideal as an inner layer beneath skirts.
Shop NowBehind The Story
Our Mission
For every woman who keeps challenging herself
Since its founding in 2011, kay me, the brand behind “Yui,” has been supporting women who take on challenges around the world. At the heart of the brand lies a strong desire to help women facing challenges live “more comfortably, more authentically.” “Yui” carries forward that spirit — born as wellness-tech wear that brings moments of balance and the beauty that comes from confidence to the busy modern woman.
Founder’s Story
The answer inspired by hard work
Born from founder Kemi’s own experience as a hard-working professional, “Yui” is wellness-tech wear designed for women who work. As a former consultant, Kemi often struggled with shoulder tension and fatigue caused by long hours at her desk and frequent business trips. She realized that true drive doesn’t come from self-sacrifice for success, but from first learning to love yourself. With that insight, she named the brand “Yui,” expressing the wish to cherish the one and only, irreplaceable “me.”
Design Journey
Giving shape to the true voices of working women
At kay me, about 80% of management positions are held by women. Female leaders and team members in their 20s to 50s—each navigating different life stages—came together to share their real, everyday concerns: cold sensitivity, shoulder stiffness, wrinkles and loss of shape, and the constant challenge of balancing beauty with comfort. Through in-depth discussions based on these real voices, we developed wear that helps women avoid carrying the fatigue of one workday into the next. “Yui” is wellness wear born from the perspective of working women themselves — a truly solution-driven creation.
Scientifically Proven
Science-powered circulation support
The wellness-tech fabric used in “Yui” is specially processed with a blend of multiple natural minerals. When warmed by body heat, these minerals re-emit far infrared rays — including terahertz waves — which activate the body’s water molecules to help promote blood circulation¹. Unlike conventional heat-retaining fabrics, this technology directly supports circulation itself while gently generating a natural, soothing warmth.
¹ The special fabric used in this product has been verified by its developer to have a “circulation-promoting effect through far infrared rays.”
Customer’s Voice
The perfect piece I’ve finally found.
“I used to hesitate with other wellness-tech wear because most designs looked too casual. But Yui not only promotes circulation — it also gives a beautifully sculpted silhouette. It’s exactly what I had been looking for! I can wear it both while working and while sleeping, and I wake up feeling completely refreshed. I can’t live without it anymore.”
＼ A perfect gift for someone special ／
We offer complimentary gift wrapping. Why not send a special gift to someone dear to you — filled with your appreciation and celebration?
＼ Feel the difference in store ／
Join our sample exhibition to experience the products firsthand.
- Oct 21 (Tue) – Oct 26 (Sun): Kyoto Store
- Oct 28 (Tue) – Nov 5 (Wed): Umeda Store
- Nov 7 (Fri) – Nov 14 (Fri): Nihombashi Store
- Nov 15 (Sat) – Nov 23 (Sun): Ginza Main Store
- Nov 24 (Mon) – Nov 30 (Sun): Yurakucho Store
FAQ
Perfect match with
Flight wear
Spend More, Save More
New Year Campaign
Power & Elegance
for the Lunar New Year
Boosts Your Natural Flow
Wellness Tech Wear “Yui”
kay me club has been launched! Online Store Renewal Campaign
Freedom in every moment! New activewear that sets you free
kay me club has been launched! Online Store Renewal Campaign
Stay comfortable even in hot and humid situations with cool-to-the-touch, contact-cooling fabric!
Try-On and Compare before Buying!
We have 'Try-On Delivery' service before you actually
purchase! You can try on to see if the size fits.
Easy 3 Steps
Order
Try-On
Purchase or Return within 8 days
Japan Quality
1
Masterpieces by Japan's top artisans
Every detail is calculated to create a sculpted silhouette, with fine divisions, delicate gathers, and precise pattern placement for perfect beauty.
2
Advanced technology 3D body style
In order to create a three-dimensional and beautifully sculpted silhouette, every detail is meticulously calculated. The garment is designed with finely divided pattern pieces, incorporating delicate gathers and drapes. Even the placement of patterns is precisely adjusted, and each piece is carefully cut with the utmost attention to detail—ensuring flawless beauty in every garment.
3
Timeless pieces to be cherished for years
Sewing stretchy fabric with stretchy thread — that is the pinnacle of craftsmanship. Each part is carefully held by hand, different threads are used depending on the area, and adjustments are made down to the millimeter. In a setting where mistakes are not allowed, every single stitch is made with dedication and precision, resulting in garments that are both beautifully crafted and exceptionally comfortable to wear.
3 Key Values
✔ Stretchy Fabric
✔ Temperature-Regulating
✔ Light Weight
✔ Machine-Washable ✔ Wrinkle-Free ✔ Instant Styling
✔ Hour Glass Silhouette ✔ Original Print ✔ Premium Material
Easy 2 Steps
Tips for Washing and Drying
Toss it in For a Full Wash
⚫︎ Machine wash on regular or “delicate” setting
⚫︎ Use regular detergent or detergent for delicate clothing. For jackets, it is recommended to put it into a laundry net
Hang it to dry, and it’s ready in a few hours—no ironing!
⚫︎ Dries in just 3–4 hours. Recommended to put on a bathroom dryer or fan
⚫︎ Avoid using a dryer or dry cleaning
