According to the Japan Meteorological Association's long-range forecast (one-month forecast), temperatures and rainfall in the Kanto and Koshinetsu regions are expected to be higher than average. As a measure against the continuing heat, "wearing long pants under your regular pants is fine," but to "reduce discomfort" under your shirt, it's also important to add a summer undershirt (innerwear).
Assistant buyer Ohashi, who is in charge of men's underwear, says, "The role of summer underwear is to reduce the discomfort index from 100 to 70-80. That alone can make a big difference in comfort." This is a special feature on recommended men's underwear that answers the question "How can I stay cool?" which has been frequently asked by customers this year.

Click here for an article about recommended men's underwear for summer.
• [Special Feature] 8 Recommended Men's Underwear Items for Mid-Summer, Selected by an Underwear Buyer, Based on Your Needs!
• [Roundtable Discussion] Do you wear pajamas to bed? How to choose pajamas that improve the quality of sleep, which accounts for one-third of your life.
・[ISETAN MEN'S × ZIGSOW Collaboration Project, 9th Edition] SEEK tried out their "U-neck T-shirt, knee-length".
View the "long pants" product list on the Isetan online store.

Ohashi, Assistant Buyer in charge of Men's Underwear

Wearing one extra layer of underwear in the summer is the key to beating the heat!

Isetan Shinjuku Store, Men's Building B1F, the long pants (long trousers) sold in the men's underwear section are often perceived as being too hot if you add an extra layer of underwear...
Ohashi explained, "What I tell customers repeatedly in stores is that 'wearing an extra layer will keep you cooler.' When you wear underwear developed for summer, the underwear absorbs sweat, which helps to suppress the rise in body temperature. In addition, the functions of the underwear reduce the discomfort of your shirt sticking to your skin when you sweat, as well as the sweat stains and odors that inevitably occur."

"This summer, a common concern we hear from our customers is, 'I want to be a little cooler and a little more comfortable.' Wearing an undershirt not only reduces your own discomfort, but we also recommend wearing one as a matter of summer etiquette," he continues.

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SEEK
U-neck T-shirt / High-twist yarn (EE3415) Available in 2 colors ¥3,024 View product

First and foremost, we recommend SEEK 's best-selling "Cut-Off® Series" as a helpful innerwear option for businessmen. It features tightly twisted yarn (DRY FEEL) and also boasts deodorizing properties (DEODORANT).

"This series features a cut-off® design around the neckline, cuffs, and hem that won't show through outerwear. The beige color is particularly popular as it won't show through shirts or other outerwear, and won't show through white shirts. Also, because it's made with highly twisted yarn, it has less contact with the skin, resulting in a smooth and dry touch. The material is a blend of cotton and synthetic fibers, so it takes advantage of the sweat-absorbing properties of natural cotton while adding the quick-drying and shape-retaining properties of synthetic fibers," says Ohashi.
This long-selling item combines the original function of underwear—effectively absorbing and drying sweat—with a design that makes it feel as if you're not wearing anything at all.

【Check Point!】

• Cut-off® specification

• Uses highly twisted yarn for a dry feel

- Deodorizing treatment, antibacterial and odor-resistant treatment

SEEK
Boat neck T-shirt (EE2812) Available in 5 colors ¥3,024 View product

When you're worried about sweat stains on a gray T-shirt, or when you want to wear your favorite brand T-shirt, SEEK 's T-shirt compatible innerwear is a must-have.
The neckline, cuffs, and hem feature a cut-off design that won't show through outerwear, and the neckline is a boat neck design. It's resistant to sweat seeping through, and the short sleeves make it perfect as an inner layer for a T-shirt.

"You might be wondering, 'An undershirt to wear under a comfortable T-shirt?' But give it a try. It's discreet, effectively guards against sweat, has a water-repellent finish on the surface, and is treated with an odor-eliminating finish to suppress unpleasant sweat odors. A must-have for both stylish looks and protecting your precious T-shirts from damage!"

【Check Point!】

• Sweat stain resistant finish • Boat neck design to prevent it from showing at the neckline • Cut-off® finish • Deodorizing and antibacterial treatment

SEEK
ICEY COTTON V-neck T-shirt, available in 2 colors, ¥2,700 (EE1015A) View product

For those who only wear 100% cotton underwear but want something cool and quick-drying in the summer, we recommend this item from SEEK , made with ICEY COTTON, a cotton material that feels cool the moment you put it on.

Ohashi gives it her seal of approval, saying, "This popular series is made of 100% cotton, but with significantly improved quick-drying properties. Not only does it feel dry and refreshing even when you sweat, but it also has pads that efficiently absorb underarm sweat. The surface of the pads is treated with a water-repellent finish so that sweat stains do not show through to the outside. This is the perfect innerwear for people who sweat a lot and don't want to go out in the summer, who want a cool feeling when wearing it, and who want to enjoy fashion!"

【Check Point!】

・Made with ICEY COTTON, it provides a cooling sensation and quick-drying properties every time it touches your skin.
• Includes underarm pads • 100% cotton for a great feel against the skin
- The back is designed to be longer, so your back is less likely to be exposed when you bend over.

Cool Magic
V-neck T-shirt (BAC215B) Available in 3 colors ¥2,700 View product

"Experience the dry comfort of Gunze's Cool Magic short-sleeved T-shirt, which quickly releases body heat, absorbs moisture, and quickly wicks it away," says Gunze.
This deodorant innerwear features Coolmake®, which provides a cool-to-the-touch feel and quick-drying properties, and Deogreen®, Gunze's original odor-eliminating treatment. It's also conveniently designed for indoor drying.

【Check Point!】

• Coolmake® provides a cooling sensation and sweat-wicking, quick-drying properties.
• Deodorizing treatment: Deogreen®
・Suitable for drying indoors

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SEEK

Left/Mesh Inner U-Neck T-Shirt (EE2516) Camouflage Pattern, Available in 4 Colors, ¥3,564 View Product

Right/Mesh Inner U-Neck T-Shirt (EE2515) Plain, Available in 2 Colors, ¥3,564 View Product

"Today I'm wearing this SEEK mesh," says Ohashi, highlighting his favorite innerwear made from a fully mesh material that quickly wicks away sweat.
"Because it's made of mesh, it offers excellent breathability and quick-drying properties, and the camouflage pattern (EE2516) is less likely to show through shirts. The sleeves are shorter, so it can be worn as an inner layer under short-sleeved shirts or polo shirts. We highly recommend trying it under a pique polo shirt," says the recommended reviewer.

【Check Point!】

• Made entirely of mesh material for excellent breathability and quick-drying properties.
• Cut-off® specification • Camouflage pattern model is less likely to show through.

SEEK

Cut-off material/V-neck T-shirt (EE2416A) Available in 2 colors ¥3,780 View product

A V-neck top with a summery pattern is now available. Made with a cooling material, this model boasts excellent moisture-wicking and quick-drying properties. The neckline, hem, and cuffs feature a carefully crafted cut-off design, making it less likely to show through outerwear, and the shorter sleeves make it easy to layer under polo shirts.
Unlike plain designs, these original botanical prints are not embarrassing to take off in public, and even a glimpse of them makes you stand out!

【Check Point!】

• Made with cooling material to alleviate heat • Cut-off® design • Botanical print for peace of mind even if it accidentally shows!

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SEEK

2-Pack T-Shirts (EE00002) ¥5,400 View Product

Developed in collaboration with Gunze and Mitsukoshi Isetan, SEEK 's first 100% cotton two-pack T-shirt is now available. It can be worn as underwear or as an inner layer under a jacket, utilizing the technology of an underwear manufacturer, and features underarm sweat pads and odor-eliminating functions.

"The design combines a crew neck with a chest pocket and a V-neck (without a pocket). The fabric is treated with Gunze's patented "Ecomagic Processing," which reduces chemical irritation and leaves less detergent residue, resulting in improved stain removal. It also has excellent deodorizing properties, neutralizing and breaking down ammonia, the source of sweat odor. Please use it as a versatile item in your wardrobe."

【Check Point!】

- Can be worn alone as underwear or innerwear - Includes underarm pads - Enjoy two designs in one pack - Odor-eliminating treatment

For articles on men's underwear recommended for summer, click here: [Special Feature] 8 Recommended Men's Underwear Items for Mid-Summer, Selected by an Underwear Buyer (by Problem Type)
• [Roundtable Discussion] Do you wear pajamas to bed? How to choose pajamas that improve the quality of sleep, which accounts for one-third of your life.
・[ISETAN MEN'S × ZIGSOW Collaboration Project, 9th Edition] SEEK tried out their "U-neck T-shirt, knee-length".
View the "long pants" product list on the Isetan online store.

*All prices include tax.

inquiry
Isetan Shinjuku Store, Men's Building , B1F = Underwear, socks, nightwear
03-3352-1111 (main representative)
For inquiries via email, please click here.