A light (145-155g/㎡) merino tank top that promises unparalleled freedom and comfort.

Our 100% pure Merino wool will make your hiking more comfortable by keeping unwanted odors to a minimum.

Not only does it help regulate both temperatures and humidity when you hike, it can also be tumble-dried (maximum 60°C), making it a great piece for long-distance adventures.

Though this product dries slower than general synthetic base layer T-shirts, it is less likely to cause hypothermia caused by the evaporation of sweat or other moisture. In other words, the new 100% Light Merino series focuses on moisture absorption rather than quick-drying, and on thermal insulation rather than cooling properties.

When the temperature changes drastically
Wool is good at maintaining a constant temperature inside the garment, keeping you dry and comfortable even in situations where temperatures can suddenly change.

When worn under an outer shell
Synthetic base layers with low moisture absorption can feel very humid and stuffy. On the other hand, our 100% Merino’s superior moisture absorption properties, will help to keep you dry and comfortable when worn under an outer shell.

When worn for long hours
Synthetic clothes often become smelly relatively early on, even if they are deodorant finished. Wools, on the other hand, naturally eliminate odor when the fabric dries even after being soaked in sweat. This powerful anti-odor performance allows you to keep moving day after day, relatively comfortably without smelling too bad. For details, please visit HERE (Currently available in Japanese only).

When packing capacity is limited
Our Merino wool products can be worn in various situations for long hours without getting too smelly, minimizing the need for extra clothes in your backpack.

Wool base layers are chosen by many hikers for the material’s excellent odor-neutralizing performance. Some say it’s almost odor-free even after a week of heavy hiking, but we’ll let you (and your friends) be the judge of that…

Wool is great to help you keep warm and cool as it naturally controls the moisture level within the clothes, always keeping you comfortable throughout the year.

Wool has some remarkable natural properties that make it ideal for outdoor use. When it gets wet, it releases a small amount of heat through moisture absorption—a process known as heat of sorption. At the same time, wool’s low thermal conductivity means it doesn’t pull heat away from your body like some synthetic fabrics can.

Even when soaked, wool fibers remain naturally springy, so they don’t collapse like cotton. This helps trap insulating air between the fibers, maintaining warmth. Plus, wool absorbs moisture into the core of each fiber, rather than sitting on the surface—so it can wick sweat away from your skin and still feel relatively dry to the touch.

Normally, Merino wool products cannot be tumble dried as the heat causes shrinkage and deformation of the fabric, but our proprietary 100% Merino wool can be tumble dried at low temperatures (Upper limit of 60 Celsius). This makes it better suited for long hikes and travels, as you can easily　use dryers at laundromats and hotels.

The neckline and armholes feature a durable, stretch-resistant binder finish.

Our merino wool products are purely made of merino wool, with no synthetic fiber added. Why? Let me explain.

Merino wool has various unique features such as temperature/moisture control and odor-resistant performance and is perfect for hiking. However, it does have drawbacks that should not be underestimated: the tendency to deform and shrink, and poor durability.

To compensate for the drawbacks, many manufacturers add synthetic fibers to strengthen their merino fabrics. We, however, are certain that pure merino’s advantages outweigh its weaknesses, so we want to stick with 100% merino to maximize the natural benefits of pure merino wool.

As shown below, our in-house tests show that as the percentage of the synthetic fiber increases, merino wool’s natural advantages, such as temperature/moisture performance, inevitably decrease:

As explained above, wool or merino wool has various features and functions, but it is not flawless.

• Easily absorbs moisture and becomes heavy
  Wool can get quite heavy as it is great at absorbing moisture. This also means that wool takes longer to dry than synthetic fibers, but compared to cotton, it actually dries faster.

• Liked by insects
  Soft, natural fibers such as wool, cashmere, and silk are prone to damage by insects.

• Easily damaged
  The relatively short fibers of wool mean that wool fabrics are easier damaged than synthetic and cotton fibers. However, small holes can easily be fixed with a bit of pure wool and a needle.

• Shrinks easily
  Wool generally shrinks easily, even when shrink-proofed. To reduce shrinkage, after washing, stretch the shirt to its original shape and gently iron it before drying.

• Distortion
  When knitted wool fabrics are washed, the material is likely to distort diagonally because the yarned fibers absorb water, swell, and tend to untwist. Consequently, the shape of the shirt may distort slightly with washing.

• Distinctive smell
  The wool comes from sheep and you may experience a distinctive animal-like smell coming from your t-shirt when damp. This smell usually disappears after the fabric dries.

The above information was compiled and edited based on the interview with the textile company and the research institute, and the reference book below:

Bibliography:
Structure and Physical Properties of Wool, Japan Wool Industry Association, Seni Co., Ltd.

The fabric will stretch approximately 1 cm vertically when hung to dry from from the listed values.

• The above values show the measurement when the item is brand-new and unwashed.
• Due to the characteristics of elastic knit materials, the sizing may vary 1-2cm.
• Due to the difference in the shrinkage tendency, there may be some individual differences in the measurements of the product.
• Tumble-drying at low temperatures may cause more shrinkage than when dried by natural drying. The shrunk item will be restored by washing and line-drying again.
• Iron with steam if shrunk after the wash and drying. Gently stretch the fabric while ironing for the best results.

Please be aware that color may transfer if this product rubs against white or light-colored shirts when wet from sweat or rain.

Use a low-temperature setting (up to 60°C) when using a tumble dryer. However, frequent use may cause fabric pilling, so we recommend limiting dryer use.

To prevent wrinkles, avoid bunching during drying. Do not use a laundry net—dry items individually or with plenty of space, and remove them promptly after drying.

Tumble-drying may cause the fabric to shrink by about 1–2 cm, but this can be reversed with repeated washing.

• Merino wool can attract moths if body oils build up in the fabric. Wash regularly to help prevent insect damage.
• When storing, use mothballs and keep the item sealed to protect it from insects.
• Yamatomichi’s 100% Merino Wool can be machine-washed on a gentle cycle.
• Due to the short fibers, some pilling or fuzz may appear at first, but this will lessen with washing as loose fibers are removed.