RECOMMEND
2026.02.27 update

[Special Feature] When should you change your men's underwear? Replacement guidelines, washing tips, size selection, and recommended underwear for different needs.（2/2）



table of contents
[Top 10 Recommended Men's Underwear Items Based on Material and Design]
      1. ■Recommended for those who prioritize materials
        1. Classic material that is gentle on the skin
        2. Simply feels great, made from high-quality materials that elevate the overall feel.
        3. Wool & cashmere: "Just right" all year round
      2. ■By problem/purpose
        4. Keep sweat stains and odors hidden and invisible.
        5. Thin yet warm. The perfect layer for winter.
        6. Reliable hold that follows your movements.
        7. The comfort of "not being constricting"
        8. Smart appearance, yet provides excellent absorbency and protection on the inside.
        9. Warms specific areas, providing comfort year-round for those prone to feeling cold in the stomach.
        10. Wearable self-care, functionality that blends into everyday life.


Top 10 Recommended Men's Underwear Items Based on Material and Design


■ Recommended for those who prioritize materials

1. Classic material that is gentle on the skin

Everyday comfort starts with "gentle materials."

Brooks Brothers
V-neck T-shirt (100% cotton / M, L, LL)
3,520-3,850 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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A classic V-neck that you can wear every day.
A basic V-neck top made of 100% cotton. The tag at the back of the neck is printed to reduce bulkiness, making it a comfortable piece to wear. It's easy to use as an everyday inner layer or under a sweater, and is relatively easy to care for.
Epoca Uomo
Silk trunks (open front)
(100% Silk / Sizes M, L, LL)
15,400 to 16,500 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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Breathable and hypoallergenic natural silk
These boxer shorts are made from 100% natural silk. With the unique luster and supple feel of silk, they wick away sweat to keep you dry and comfortable, making them a high-quality innerwear choice for all seasons. They are cool in the summer and warm in the winter.

2. Simply feels great, made from high-quality materials that elevate the overall feel.
The difference you feel the moment you touch it elevates your everyday life.

Zimeli
ROYAL CLASSIC V-neck shirt (100% cotton / S, M, L)
26,400 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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A T-shirt with a silky sheen
Made from mercerized, silky cotton, this garment offers a light and smooth feel against the skin. With its beautiful, body-hugging fit and luxurious sheen, it's recommended for those who want to elevate their innerwear.
Perofil
Short-sleeved shirt (4SEASONS)
(90% cotton, 10% polyurethane / S, M, L)
10,450 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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Imported underwear that can be worn all year round
This shirt features a three-dimensional construction designed by "4SEASONS." Made from a stretchy blend fabric, it offers ease of movement, and its tight silhouette makes it ideal for layering with a tie.
Barail & Garments
BORDERIES (Knit Trunks)
(100% cotton/S, M, L, XL)
6,001 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

High-quality boxer shorts made from extra-long staple cotton
These knitted boxer shorts are made from Sea Island extra-long staple cotton. They boast a silky sheen and cashmere-like softness, offering a comfortable fit and elegant luster. The meticulous craftsmanship ensures a superior garment.
TAKEMURA
Boxer shorts (closed front)
(75% cotton, 10% polyester, 10% nylon, 5% polyurethane / M, L)
5,280 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

Boxer shorts that feel like a luxury towel
These premium boxer briefs feature a sleeve pile fabric. The long pile provides a soft and gentle feel against the skin, similar to a towel. Furthermore, its vertical and horizontal stretchability allows it to conform to body movements, and it boasts excellent water absorption and moisture-wicking properties.

3. Just right all year round: Wool & Cashmere. Warm yet breathable. Your year-round ally.

HANRO
Silk Cashmere Short-Sleeve Shirt (65% Silk, 35% Cashmere / Sizes M & L)
81,400 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

The luxurious feel of silk and cashmere
Luxurious underwear blending silk and cashmere. Featuring a soft, smooth feel and excellent heat retention, this is the perfect choice for those seeking a refined touch against the skin.
American knitwear
Boxer briefs (closed front)
(100% Merino Wool / Sizes M, L, XL)
6,600 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

Easy-to-wear merino wool boxer shorts
These boxer briefs are made with extra-fine merino wool (17.5μm). They offer a soft, non-itchy feel, are easy to care for (machine washable), and have excellent moisture-wicking properties for year-round comfort.

■By problem/purpose

4. Keep sweat stains and odors hidden and invisible.
Whether commuting or working outdoors, sweat management involves "invisible techniques."

seek
CUTOFF Boat Neck (T-shirt compatible innerwear - EE2812A)
(M/L) 3,630 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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A garment that is discreet under outerwear and has odor-eliminating properties.
This rayon-blend innerwear features water-repellent and odor-eliminating treatment on one side. The shorter sleeves and boat neck make it less noticeable under a T-shirt, and the design helps to diffuse sweat from the chest to the back, minimizing sweat stains.

seek
CUTOFF U-neck (with underarm sweat pads, EE3417A)
(S, M, L, LL) 3,630 - 4,180 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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Effectively catches underarm sweat.
This innerwear is designed for spring and summer and features underarm sweat-absorbing pads. Its antibacterial and deodorizing properties keep it clean for extended periods, and the deep U-neck design makes it discreet under shirts. Recommended for commuting.
UNDERSON UNDERSON
Regular short boxer shorts (open front)
(1, 2, 3) 4,950 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie



Smooth, Japanese paper blend material
These short-length boxer briefs feature a dry touch thanks to their washi (Japanese paper) blend material. Their high breathability makes them ideal for hot weather or for people who sweat easily.

Bandage Pants
Boxer briefs without elastic waistband (front opening)
(M, L, LL) 4,400-4,730 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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Made from bandage material for a dry and comfortable feel.
These short boxer shorts use a uniquely developed bandage-like material. They offer both breathability and a dry feel, and the absence of a waistband provides a comfortable, non-restrictive fit.

5. Thin yet warm. The perfect winter layer: Keeps you warm without being bulky.

Kimura Knitwear Factory
Solist Heat (M/L)
Long-sleeved V-neck top (0112244002) ¥5,940 View product
Tights (0112244701) ¥6,600 View product
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

Soft, brushed fabric that is gentle on the skin.
The smooth, double-brushed fabric provides both warmth and a comfortable feel against the skin. Flat seams reduce irritation from seams, and the top features a front-to-back length difference to prevent the waist from being exposed when bending over.
seek
CUTOFF Thermal Underwear (M/L)
Long-sleeved shirt (EE8022) ¥3,850 View product
Tights (EE8001) ¥3,850 View product
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie


Thin and warm layered top and bottom
This top and bottom set is extremely thin yet offers excellent heat retention. The boat neck design makes it easy to coordinate with other clothing, and its design prevents bulkiness even when layered. It's perfect for everyday cold weather protection.

Gunze
HOTMAGIC Extreme (Long-sleeved shirt/tights)
(M・L・LL) 4,950 yen each
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie


Extra-thick brushed fabric for excellent warmth.
This classic thermal line utilizes moisture-absorbing, heat-generating fibers to provide superior warmth. Its reliable warmth makes it ideal for extremely cold climates and prolonged outdoor use.

6. Reliable hold that follows your movements. Lightweight and comfortable even when fitted.

Toot
ReNEW TOOT MESH plus (Boxer briefs, closed front)
(S, M, L, XL) 4,400 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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Mesh that combines breathability and a comfortable fit
Featuring FlexMove® mesh material, these pants offer all-directional stretch and high breathability. They also boast sweat-wicking, quick-drying, and antibacterial/deodorizing properties, ensuring comfortable wear even in sweaty weather or during sports activities.
Grave Vault
Bikini (3050975)
(M/L) 2,970 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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Bikini that doesn't show lines easily
Made from smooth nylon fabric, this garment offers a secure and comfortable fit. It beautifully shapes the hip line and features a sophisticated design that minimizes visible lines even when layered under tight bottoms.

7. Comfort that is "not constricting" - Stress-free comfort all day long.

seek
AIRZ Boxer (EEC880A, closed front)
(M, L, LL) 3,630 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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A non-elastic design for a feeling of freedom.
Featuring a non-elastic waistband design, these pants have a minimalist construction with fewer seams, making them gentle on the skin and offering a comfortable, relaxed feel that won't leave marks even when sitting.
Wacoal Men
Fundoshi NEXT (WF4030)
(M, L, LL) 2,970-3,300 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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A "fundoshi" style with breathability.
These breathable pants incorporate a "fundoshi" (traditional Japanese loincloth) style. They offer a relaxed fit with all-direction stretch while being designed to minimize visible panty lines.

8. It looks smart, but the inside has an absorbent structure for thorough protection.

Macintosh Philosophy
Light Guard Boxer Shorts (0113825600, front opening)
(M/L) 3,630 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

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It looks ordinary, but has good protection on the inside.
The triple-layer construction of moisture-wicking mesh and waterproof fabric protects against minor leaks. While it looks like a typical boxer brief, the internal structure provides peace of mind. It offers a comfortable fit even when wearing tight pants.

9. Warms specific areas, providing comfort year-round for those prone to feeling cold in the stomach.

Amwar
SILK HARAMAKI / REGULAR (belly warmer)
(Free) 6,930 yen
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie
*Available colors vary by season.

Warm your stomach with soft silk.
A belly warmer made from washable silk. It boasts excellent moisture absorption and release properties, keeping you cool in summer and comfortably warm in winter, making it suitable for year-round wear. A gentle and comfortable garment perfect for sleeping or as protection against the cold.

10. Wearable self-care, functionality that blends into everyday life.

Resona Bio
Relaxed Long Sleeve Shirt (General Medical Device)
(S, M, L) 22,000 yen *Medical device registration number: 47B3X10001RTS002
□Isetan Shinjuku Store, Men's Building, B1 Floor, Underwear, socks, nightie

Gentle and comfortable to wear, even while sleeping.
Self-medication wear made by Resona Bio , a recovery wear brand that meets general medical device standards.
Designed to support self-care when worn, it is suitable for wearing while sleeping or resting.

View Resona Bio 's product list

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Editing: STUDIO ALTA

＊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.

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