What Is Merino Wool? A Guide to Its Features and Benefits
Many people may think, “I’d like to try merino wool clothing for the first time, but I still have a few concerns.” In this article, we answer some of the most common questions about merino wool. Please take a look before choosing your first merino wool item.
What Is Merino Wool?
Merino wool is a high-quality wool obtained from Merino sheep. Its fibers are extremely fine and soft, giving it a comfortable feel against the skin. It also naturally offers odor control and temperature regulation, while providing excellent warmth and moisture absorption.
Merino wool is widely used in outdoor wear and athletic clothing, where its functionality is highly valued. In addition, it is an eco-friendly natural fiber that returns to the soil after disposal and can biodegrade even in seawater.
For more details on the advantages and disadvantages of merino wool, please see the related article below.
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Does Merino Wool Have Any Weaknesses?
Is Merino Wool Too Hot to Wear in Summer?
Merino wool can be worn comfortably even in summer. It has excellent breathability and absorbs moisture, then releases it through evaporation to help regulate body temperature.
Even on hot summer days, it helps keep the skin feeling dry and comfortable after sweating. Lightweight and thin merino wool products are especially suitable for warm seasons.
Merino wool also has natural odor-control properties, so unpleasant smells are less likely to build up even after long hours of wear.
For more details on wearing merino wool in summer, please see the related article below.
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Does Merino Wool Dry Slowly?
Compared with clothing made from quick-drying synthetic fibers, merino wool does dry more slowly. However, this slower drying speed also brings important benefits.
Ordinary synthetic clothing moves sweat from the body to the outside of the fabric and evaporates it quickly. This shortens the time sweat remains in the fibers and allows the clothing to dry quickly.
However, when sweat evaporates, it also takes body heat with it. Have you ever felt cold after sweating heavily and then entering a cool indoor space? That happens because body heat is lost along with the evaporation of sweat. This can lead to discomfort, chills, or even an upset stomach.
Merino wool, on the other hand, absorbs sweat into the fibers and helps keep it away from direct contact with the skin, allowing moisture to evaporate slowly. Because the skin is not constantly touching wet sweat, body heat is less likely to be taken away during evaporation.
In other words, merino wool dries while helping reduce sudden body heat loss, making it easier to maintain a stable and comfortable body temperature even when the wind or surrounding temperature changes.
Does It Feel Itchy?
Merino wool is made from very fine fibers, which makes it gentle on the skin and less likely to feel itchy. Even people with sensitive skin can wear it comfortably.
How Effective Is Its Natural Odor Control?
Merino wool naturally helps control odor by suppressing the growth of bacteria that cause unpleasant smells. Even after long hours of wear, odor is less likely to become noticeable.
In our own wear test, after wearing merino wool for 24 hours while exercising and sweating heavily, the garment remained odor-free for around a week. It is especially recommended for people who sweat easily or are concerned about body odor.
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Is Merino Wool Not Durable?
Many people who wear merino wool clothing are concerned about moth damage and pilling. These are indeed weaknesses of merino wool as a natural material.
Without proper care and storage, merino wool clothing may become difficult to wear after about a year. However, with correct washing and storage, it can be worn comfortably for a long time.
For more details on how to wash merino wool clothing and prevent moth damage, please see the related article below.
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How Should I Store It for Long-Term Use?
During seasons when you do not wear it often, store merino wool in a well-ventilated place and use moth repellent. Avoid damp places and direct sunlight to help prevent material deterioration.
Before storing, we recommend washing the garment, lightly ironing it if necessary, and placing it in sealed storage with a natural moth repellent.
Even during seasons when you wear it often, merino wool does not easily hold dirt or odor, so washing after 3 to 4 wears is usually sufficient. Washing less frequently also helps reduce environmental impact and slows material deterioration. However, if there is noticeable dirt or odor, wash it as needed.
Also, hanging merino wool on a hanger for a long period may cause stretching, so folded storage is recommended.
Is Maintenance Difficult?
Merino wool is relatively easy to care for. Many products can be washed in a washing machine, and light dirt can be handled by hand washing. Merino wool is also less prone to wrinkles, reducing the need for ironing.
Can Merino Wool Be Washed?
It depends on the product, but in general, many merino wool products can be washed. Use the delicate or wool cycle on your washing machine, or wash by hand to keep the garment clean.
Avoid warm or hot water, and wash with cold water. Use a detergent for delicate clothing and avoid fabric softener. If fabric softener remains in the fibers, it may reduce the natural moisture-absorbing performance of the wool.
Whether a product can be washed depends on the item, so please always check the care label before washing.
Image source: Shin Nihon Group Musashiya Co., Ltd.
How Often Should Merino Wool Be Washed?
Because merino wool has excellent odor-control properties, it does not need to be washed as frequently as other materials. Depending on how it is used, washing after 3 to 4 wears is usually recommended.
However, if there is visible dirt or lingering odor, wash it as needed.
Can Merino Wool Be Dry-Cleaned?
If the care label shows that dry cleaning is allowed, then merino wool can be dry-cleaned.
Image source: Shin Nihon Group Musashiya Co., Ltd.
Why Does It Smell Strongly When Washed?
Due to the structure of natural merino wool fibers, a slight smell may occur when the material contains water or moisture. This smell can be more noticeable immediately after washing.
This is not a product defect. The smell usually fades once the garment dries. With repeated washing, the smell also tends to become less noticeable.
It Shrunk After Washing. What Should I Do?
Merino wool may shrink when washed with warm water or dried in a dryer. To prevent shrinkage, wash with water below 30°C and allow the garment to air dry naturally.
Using a laundry net and handling the garment gently can also help reduce shrinkage.
If it has already shrunk, you may be able to gently stretch and reshape it. However, pulling too hard may distort the shape, so please handle it carefully.
What Should I Do If Pilling Appears?
If pilling appears on merino wool, it can be removed carefully with a fabric shaver or scissors.
When washing, turn the garment inside out. If hand washing, avoid rubbing the fabric, as friction can cause pilling. Gently press or tap the garment instead.
What Does Super 100’s Mean?
Super 100’s is an indicator of the fineness of the raw wool fiber. It means the fiber diameter is 18.5 microns. Please note that this refers to the fineness of the raw fiber, not the thickness of the yarn.
In general, finer fibers are softer and considered higher quality. The higher the Super number, the more delicate and smooth the wool tends to feel. Super 100’s is a suitable grade for everyday wear.
Products above Super 100’s are often used for high-end suits and premium clothing, but they may not always be ideal for everyday use. We recommend choosing the appropriate wool grade based on how and where you plan to wear the garment.
For more details, please see the related article below.
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Merino Wool Grades: Super Numbers, Yarn Count, and Price Differences Explained
Why Do Prices Differ Even Among Merino Wool Products?
Even among merino wool products, prices vary depending on fiber quality, processing methods, and brand value.
For example, higher-priced merino wool often uses finer raw fibers and rarer white wool, which is available in smaller quantities. The finer the raw fiber, the more difficult it is to process, requiring more advanced equipment and techniques.
On the other hand, wool with thicker fibers, such as 19 microns or above, or wool closer to gray or brown in color and available in larger quantities, tends to be less expensive. Products from popular brands also tend to be priced higher due to greater demand.
Also, even if a product is labeled Super 100’s, it does not necessarily mean that every fiber in the fabric is 18.5 microns. If all fibers meet the Super 100’s standard, the price is generally higher. If only part of the fiber composition meets that standard, the price may be lower.