Underwear, which we wear every day, is an item that deteriorates more quickly than it looks. This article explains the signs that indicate you should replace your underwear once a year, as well as the correct way to wash and choose the right size, in a Q&A format. In the latter half, we introduce a selection of recommended items based on material and specific concerns ( Isetan Shinjuku Store, Men's Building B1F, Underwear, Socks, Nightwear).

The motto for when to change your underwear is "once a year." If you notice signs other than visible ones, it's time to reconsider your washing routine and size selection!

■ Q&A about when to replace your appliances

Q1: What is the role of underwear that stylish men should know?

A: Underwear is the foundation of "comfort" and "cleanliness."
It absorbs sweat to regulate body temperature and softens the feel against the skin. It suppresses transparency, sweat stains, and odor, and maintains the appearance of your outerwear. It's your "partner" for grooming behind the scenes.

Q2: What happens if you wear the same underwear for a long time?

A: Sebum tends to remain on the fibers, which can easily degrade the material's functionality.
As the absorbency decreases, you'll be more prone to feeling chilled from sweat, stickiness, odor, and itchiness. The elastic and fabric will also deteriorate, affecting the fit and the silhouette of your clothes. If you notice any discomfort, it's time to replace them.

Q3: What are some signs other than appearance that indicate a car needs replacing?

A: Be careful if any of the following five apply to you!
• Even after washing, a musty smell remains. • You feel cold when you sweat (sweat chill).
• Itchy or prickly when worn • Tops: Reduced absorbency and whiteness, yellowing and staining • Pants: Fabric stretches out, reduced hold

Q4: What is the best time to replace my appliances?

A: The general guideline is that it will last about a year if you wash it 70 to 100 times, or wear it twice a week.
Synthetic fibers last 6 months to a year, while wool lasts longer (but be careful of moth damage and pilling). The change of seasons (especially March) is a good time to review your clothing.

Q5: Please tell me some tips for washing and caring for these items (for longevity and odor control).

A: The way you wash your underwear can make a big difference in how long it lasts and how it develops odors.
First, check the care label. As a general guideline, use a laundry net, use a neutral detergent with an appropriate amount of fabric softener, and avoid using a dryer; instead, air dry in the shade.
Since the optimal care varies depending on the material, it is important to follow the washing instructions, such as washing silk and wool gently with a neutral detergent, and synthetic fibers in room temperature water for a short time.

To prevent odors and yellowing, soaking in lukewarm water followed by oxygen-based bleach (when appropriate for the material) is effective. On a daily basis, washing clothes promptly after taking them off and using underarm sweat pads will help prevent these issues. Conversely, avoid leaving clothes wet, using high-temperature drying, using too much detergent or fabric softener, and not using a laundry net.

Q6: Tips for choosing the right size (waist and hip measurements / pay attention to differences between brands)

A: When choosing a size, first keep in mind that even with the same size label, the fit can vary depending on the material and brand.
■Tops
Prioritizing chest circumference (body width) over height, and considering that 100% cotton will fit just right, while stretchy materials like polyurethane blends will fit more easily even if they are slightly tighter, will make choosing easier.

■Bottoms
First, accurately measure your waist. If your hips and thighs are substantial, it's safer to consider going up one size. If you can't try them on, choose a size based on whether they "dig in," "ride up," or "bulge at the hem" when you're sitting, standing, or bending. For detailed instructions on how to measure, please also refer to our "Pants Size Guide."


Now that you know when to change, how to wash, and the right size, the next question is "what to choose?" From the underwear, socks, and nightwear lineup Isetan Shinjuku Store, Men's Building B1F, we've carefully selected and introduced 10 recommended items based on different criteria, from material preference to specific needs.