12 Reasons Why Merino Wool is the Best Base Layer For Hikes

When choosing your clothing for a thru-hike, there are loads of amazing options available. Now you have a wide range…

When choosing your clothing for a thru-hike, there are loads of amazing options available. Now you have a wide range of synthetics, wool, and then blends. This may make you wonder why is merino wool is the best base layer.

Merino is odor-resistant and a near-perfect clothing choice for a thru-hiker, with the only true negative being price. But currently, no other synthetic fabrics with the same level of performance in durability, warmth, and weight with this level of benefits.

Let’s examine why merino is a perfect material for hiking base layers as it is for nearly any outdoor activity, including thru-hiking:

Merino sheep on the farm

12 Reasons Why Merino Wool is the Best Base Layer

A merino wool base layer option is perfect for hiking as it is loaded with many features that increase the performance and lifespan of the garments. Some advantages of merino wool I will cover below.


If you haven’t been on longer duration thru-hikes, then the main benefit of merino may not seem all that amazing. Still, merino wool is naturally odor-resistant, which helps keep the stank lower by eliminating the smelly bacteria accumulated.

Being stinky is unavoidable, but anything you can do to minimize the funk is worth it! As your hike continues, you will be in close quarters with other hikers, and no one likes a stinky hiker.

To take full advantage of this odor-resistance feature, you should choose a base layer that is 100% merino wool. Some companies cut costs by only using a blend of materials like polyester, which significantly reduces the odor-resistant properties.

Temperature Regulation & Breathable

Another great feature is that merino wool is an excellent temperature regulator. This is due to how the fibers are constructed, as they can absorb and release moisture vapor.

This means it will help keep you cool in hot weather and warm in cold weather. The base layers are moisture-wicking as well, so you won’t feel as sweaty, even when pushing hard on a hike or in warmer temperatures.

The breathability is essential for any hiker because you want your clothing to dry quickly. If your clothing takes too long to dry in cold rainy conditions, it increases the risk of developing hypothermia.

UV Protection & Sun-Resistant

Merino wool is known for its protection from the elements, including UV rays and the sun. The natural fibers provide a physical barrier between your skin and the sun’s harmful rays.

This is essential because, as we all know, extended exposure to UV rays can cause Sunburns, which is never fun. The last thing you want is to deal with a painful sunburn while trying to hike 20 miles a day!

Multiple Fabric Weights

Merino comes in many weights, and while suitable for next-to-skin layers, it can perform well as socks, underwear, and as a mid-layer and even outer layer, depending on construction.

These weights allow for a more custom use depending on your needs, which is essential for a thru-hiker. You may want a lighter base layer for hot weather and a heavier one when the temperatures drop at night or in the morning.

The different weights also offer more durability as the thicker fabrics last longer before developing holes.

Insulates When Wet

Unlike synthetic materials, damp merino provides you with massive heat retention properties. The fibers are hollow, so they can trap heat from your body when wet and prevent it from escaping.

This is essential for thru-hiking because you will inevitably get wet at some point, whether from sweat, torrential rain, or just a simple river crossing.

When this happens, you want your clothing to insulate you; unfortunately, fast-drying fabrics like traditional synthetic base layers don’t do as much to keep you warm when wet.

Dries Incredibly Fast

Merino also is a quick drying fabric. The natural fibers allow for better airflow so moisture can evaporate quickly, even in high-intensity activities like hiking.

This is essential because you don’t want your clothing to stay wet for too long as it will cause you to feel cold and could lead to hypothermia.

The faster drying properties also help to prevent chafing as the fabric won’t stick to your skin; this is why merino wool has become a favorite for socks.

Non-Itchy & Comfortable Along With Soft To The Touch

Merino is a 100% natural fiber sourced from merino sheep, but unlike standard wool, it is non-itchy. The fibers are much finer, and the fabric is softer to the touch, which makes it more comfortable to wear.

Natural fibers also help to regulate temperature and moisture better than synthetic materials like polyester. This is essential for long hikes as you want to be as comfortable as possible, especially when carrying a heavy backpack.

This contrasts with traditional wool, which can be quite itchy and uncomfortable, especially when wet, due to the different fibers from different sheep.

Amazing Cooling Properties

Another awesome property is the moisture management and cooling properties of merino. The fabric is great at wicking away sweat and moisture from your body, which is essential for keeping cool in hot weather.

The fabric can also release heat vapor, so you won’t overheat, keeping your body temperature lower even when working hard on a hike.

This is essential because you want to ensure you don’t overheat, which can lead to dehydration and heat exhaustion.

Impressive Warmth

The wool has an amazing warmth-to-weight ratio that is perfect for thru-hiking. The merino fibers can trap heat from your body while still being lightweight so that you won’t feel weighed down by your clothing.

This is essential because you want to be as comfortable as possible on your hike, and the last thing you want is to feel burdened by your clothing.

The warmth is also great for cold weather as it will help to insulate you even when wet, as mentioned above, which is essential for preventing hypothermia.

Check Out the High-Quality Merino Clothing From Ridge Merino


Coming from merino sheep, the natural fiber is infinitely sustainable as the sheep need the excess removed in the warm weather to help their body heat dissipate. Merino clothing is also a normal fiber, making it biodegradable, unlike synthetic materials.

For many thru-hikers, this is important as they often spend extended periods in nature and want to ensure that they limit their impact on the surrounding area and ensure their clothing is not harming the environment.

The sustainability of the fabric is also great for those looking for ethical clothing options as no animals are harmed in the production of merino wool clothing.

Durable Fabric

Merino garments are strong and long-lasting, making them perfect for multi-day trips that a long-distance hiker often takes. The wool is resistant to wear and tear and can withstand repeated washings without breaking down like some synthetic materials.

This is important for many thru-hikers as they need their clothing to last as long as possible and not need constant replacements during their trip. Nothing is as irritating as clothing and gear falling apart after a few days.

Fire Retardant

Another great feature is that merino is fire-resistant. This is due to the high nitrogen levels in the fibers, making them less flammable.

The flame-retardant characteristics of this material are due to its distinctive chemical structure, which includes a high nitrogen content combined with high relative moisture content.

Synthetic garments can burn and melt, making them dangerous to wear in certain situations. However, with merino, you can be confident that your clothing won’t catch fire, making it a safer option for hikers.

Final Thoughts on Merino Wool as a Thru-Hiking Base Layer

The market for merino wool has been growing as more and more options come on the market, and the prices, over time, I expect thru-hiking base layers from many more manufacturers and vendors, which should bring the costs down even more.

Now that you understand all the benefits that merino wool offers, it is easy to see why this fabric is the best option for a thru-hiking base layer.

The moisture management, cooling, and warmth properties are essential for comfort on your hike, and the sustainability and durability of the fabric make it a great long-term investment.

So, if you are looking for the best base layer for your next thru-hike, look no further than merino wool. What are your thoughts? Is there another base layer material you prefer?

Josh Koop

I turned 40 and realized I needed to change my life from being a desk-bound IT worker slowly dying in a cubicle. I have been working on ways to build my knowledge and skills, along with gear. I have plans to do a thru-hike on the Lone Star Hiking Trail, Ouachita Trail, and Pinhoti Trail in the next year.

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