How to Choose T-Shirts That Resist Sweat Odor: Recommended Picks for Summer

Every summer, one of the biggest concerns is sweat odor. When sweat soaks into a T-shirt, the smell can become extremely unpleasant when you check it.

T-shirts made from synthetic fibers without deodorizing treatment tend to develop a sweaty odor once sweat is absorbed into the fabric. That is why some people prefer T-shirts made from natural materials such as cotton or linen.

Wool garments can also absorb substances such as ammonia and lactic acid, helping reduce sweat odor. The Merino wool T-shirts available from C-one also have natural odor-resistant and antibacterial properties, making them popular among people who enjoy outdoor activities such as hiking and camping, people who tend to sweat easily in daily life, and business professionals who are often out and about.

By wearing a T-shirt that is less likely to develop sweat odor, you can reduce unpleasant smells during summer. From here, we will take a deeper look at what causes sweat odor, how to choose T-shirts that are less likely to smell, and recommended materials and products.

Unpleasant Summer Odor Is Caused by Bacterial Activity

We often say “sweat odor,” so it is easy to assume that sweat itself smells. However, sweat itself is actually odorless. Odor occurs when sweat mixes with sebum and dirt, which bacteria then break down as food, producing odor-causing substances.

There are two types of sweat glands: eccrine glands and apocrine glands.

Eccrine glands are distributed across most of the body and produce sweat when it is hot, when you exercise, or when you eat spicy food. Sour smells or odors similar to a damp cloth are produced when bacteria break down sweat from the eccrine glands.

On the other hand, apocrine glands are mainly found in areas such as the underarms, nipples, and lower abdomen. These glands produce sweat when you feel nervous or excited in front of others, and the sweat contains components such as small amounts of protein, lipids, and ammonia. The distinctive odor commonly known as underarm odor occurs when bacteria break down sweat secreted from the apocrine glands.

Measures such as wiping sweat frequently, soaking in a bath, using antiperspirant, and improving your diet can help reduce sweat odor. However, these methods usually require long-term improvement and do not eliminate sweat odor immediately. That is why choosing a T-shirt that can help reduce sweat odor is important.

How to Choose a T-Shirt That Helps Reduce Sweat Odor

Here is how to choose a T-shirt that helps reduce sweat odor.

Choose Clothing Made from Natural Materials

Natural materials include linen, cotton, wool（wool / cashmere / alpaca / angora / mohair / camel, etc.）, and silk. Clothing made from natural materials is gentle on the skin and comfortable to wear. Natural materials also tend to have strong odor-resistant properties, making them less likely to develop sweat odor. In addition, they are highly breathable, allowing sweat to evaporate quickly and helping suppress unpleasant smells.

Avoid Synthetic Fibers Such as Polyester

Polyester easily absorbs sebum and dirt, which are sources of odor, so it tends to develop unpleasant smells. It also has low moisture absorption and can become stuffy, making odor more likely to build up. When moisture vapor remaining on the body cannot be absorbed properly, it creates a stuffy feeling, which can lead to sweat odor.

Choose Quick-Drying Clothing with Odor-Resistant and Antibacterial Treatment

Some polyester T-shirts are treated with odor-resistant and antibacterial finishes. These T-shirts are less likely to smell and dry quickly even after absorbing sweat. However, because odor-causing substances such as small amounts of protein, lipids, and ammonia may still remain, sweat odor tends to linger more than it does with natural materials.

For a T-Shirt That Helps Prevent Sweat Odor, We Recommend Merino Wool

Merino wool is obtained from Merino sheep and is known for its especially fine and soft fibers. Because of its high comfort and functionality, it is popular not only among outdoor enthusiasts but also among people who are sensitive to fashion and quality.

When people hear “wool,” many imagine winter clothing and assume it must be hot. In fact, Merino wool has low thermal conductivity and feels very cool in summer, making it one of the recommended materials for T-shirts.

If you are wondering, “Isn’t it hot to wear in summer?” please also read “Are Merino Wool T-Shirts Too Hot for Summer? Why They’re Great for Daily Wear, Business, and the Outdoors” for more details.

Below are the reasons why Merino wool T-shirts are recommended as T-shirts that are less likely to develop sweat odor.

Natural Odor-Resistant and Antibacterial Properties Help Reduce Odor

Merino wool is a natural wool fiber, and its unique structure has the ability to absorb and trap odor-causing bacteria. By trapping bacteria and helping prevent their growth, Merino wool helps suppress odors such as ammonia-like smells and acetic acid odors, which are sour smells.

Excellent Moisture Absorption and Release Help Prevent Stuffiness

Even when you sweat, Merino wool efficiently absorbs moisture from the skin and releases it into the outside air, making it less likely to feel stuffy and less likely to trap odor. Not only does it reduce the amount of sweat left on the skin, but it also quickly releases absorbed sweat, making it harder for sweat and odor to remain in the garment itself.

Do Merino Wool T-Shirts Really Resist Odor?

You may be wondering, “Do Merino wool T-shirts really resist odor?” To help answer that question, we have shared some customer feedback from people who have used C-one Merino wool T-shirts on Instagram. Please take a look.

Although this article is not about a C-one product, we are also including a personal blog post from someone who experienced the benefits of Merino wool. If you would like to learn more about the effects of Merino wool, please take a look. C-one products offer the same type of performance.

■Reference article
A 100% Merino Wool Experiment with a Husband Who Has Strong Body Odor（lol）

However, if you keep wearing Merino wool without washing it, it will eventually start to smell. Please wash it appropriately and keep it clean. We explain how to wash it in “How to Properly Wash Merino Wool Products: Washing Machine, Hand Washing, and Washing Frequency,” so please take a look.

Recommended Merino Wool T-Shirts That Help Reduce Sweat Odor

Here, we introduce recommended Merino wool T-shirts available from C-one. At C-one, we choose the well-balanced Super100's Merino wool after considering softness, luster, and durability. If any product catches your eye, please take a look at the product page.

C FLEX Wool T-Shirt

This C FLEX T-shirt features an integrated structure from the shoulder to the sleeve, making it easier to move your arms while creating a stress-free and flexible design. It also pursues comfort through the use of wool material.

Compared with ordinary T-shirts, this innovative design responds more flexibly to arm and body movements. Its special structure allows your arms to move more easily, supporting unrestricted freedom of movement.

In addition, our unique sewing technique creates a comfortable fit with less stress on the body, allowing you to enjoy a comfortable wearing experience. The C FLEX T-shirt is one of C-one’s signature products, made with premium wool material and careful attention to Japanese manufacturing quality.

C BASIC Merino Wool T-Shirt

A short-sleeve Merino wool T-shirt made from 100% fine Merino wool with natural temperature-regulating properties.

Available in five colors: dark navy, royal blue, lavender, light pink, and dark brown. This T-shirt can be styled for many different occasions and features a unisex design suitable for both men and women.

C HIGH END Merino Wool T-Shirt

The C HIGH END Merino Wool T-Shirt is a made-in-Japan item designed with a higher neckline to prevent your skin from directly touching a jacket when worn underneath.

Compared with conventional T-shirts, this higher neckline helps reduce friction and discomfort around the collar. It is made with high-quality Merino wool, giving it a smooth feel against the skin, excellent breathability, and a less stuffy wearing experience.

It can be worn comfortably even in summer. Made by Japanese craftsmen, this high-quality T-shirt pairs well with jackets and can be used widely from business settings to casual styles.

C FLEX Merino Wool Polo Shirt

A polo shirt made from 100% fine Merino wool with natural temperature-regulating properties.

Because it has a collar, it is also ideal as a uniform for people whose jobs require active movement. Of course, it is also suitable for sports such as golf.

It can also be worn as an inner layer under a jacket, making it suitable for business settings as well. From work to sports, this one piece can be styled in many ways.

Made with high-quality fine Merino wool, it feels smooth against the skin, offers good breathability, and is less likely to feel stuffy. It can be worn comfortably even in summer. Made by Japanese craftsmen, this polo shirt is high quality, pairs well with jackets, and can be used widely from business settings to casual styles.

This Summer, Take Care of Sweat Odor with a Merino Wool T-Shirt

If you struggle with sweat odor every summer, such as feeling uncomfortable because of sweat smell or needing to carry more items like antiperspirant, sweat wipes, and towels, we recommend trying one of the Merino wool T-shirts introduced here and experiencing its natural odor-resistant and antibacterial properties. Once you try it, you may find it hard to get through summer without a Merino wool T-shirt. C-one offers several Merino wool T-shirts suited for outdoor activities, everyday life, and business settings, so please take a look.