Best Merino Wool Clothing (2026): Base Layers, Hoodies, Jackets

Merino wool is a super fiber that's both natural and highly technical. The best merino wool clothing somehow manages to be comfortable in 95-degree heat, while merino base layers keep you warm well below freezing. Unlike synthetic fibers derived from petroleum, merino wool is renewable.Merino wool’s versatility means there’s a bewildering array of blends and options. Here are our favorite merino wool products that we've tested by wearing and washing (usually in cold water and hung to dry, although we do machine-dry them just to see what happens) over the course of months and, in some cases, even years. Be sure to also check out our apparel guides, including Best Merino Wool T-Shirts, Best Base Layers, Best Puffer Jackets, Best Hoodies, and Best Hiking Boots.Updated August 2026: I've added a new section for merino-blend pants and additional everyday wool clothing, and swapped out a few sold-out items for this autumn's new arrivals. I've also updated prices and links throughout.Table of ContentsBest Lightweight Base LayerBest Heavyweight Base LayerBest Everyday Base LayerOther Great Base LayersBest Merino HoodieA Hoodie for KidsBest Mid-Layer JacketsBest Merino T-ShirtsBest Merino SweatersBest Merino PantsBest SocksBest Men’s Merino UnderwearBest Women’s Merino UnderwearBest Everyday Merino ClothesWhy Is Merino Wool So Great?Merino wool is great because you're borrowing a sheep's ability to keep itself warm or cool based on the temperature, a process often referred to as thermoregulation. If you've only ever worn the sort of itchy wool sweaters your proverbial grandmother supposedly made, you might wonder what all the fuss is. The answer is that Merino sheep have thinner, softer wool, which has evolved to keep them comfortable across a wide range of temperatures and is comfortable to wear next to your skin. Wool is sustainable, too. One sheep can produce 4 to 5 pounds of wool per year. But be aware of merino greenwashing, as the process from sourcing the wool to the end product may still involve chemicals, polluted waters, synthetic fabrics, and other things that increase the carbon footprint. Research a company's methods and claims, as cheaper merino wool may not be as sustainable as marketed.What Does GSM Mean?Merino wool comes in different weights, which you will often see listed as “200 GSM” or something similar. GSM refers to grams per square meter, sometimes listed as g/m².) What's important is the scale and where your garment falls on it. At the low end, you have T-shirts and underwear, which are typically 150 GSM, though we have seen some as low as 120 GSM. Generally, anything below 200 GSM will be a good base layer or T-shirt. From 200 to 300 GSM are your mid-layers, and anything above 300 is a heavier garment.If you're more familiar with synthetic ratings like those often used on fleece, know that, from my experience, about 120 to 160 GSM wool corresponds to 100-weight fleece, 160 to 200 GSM wool roughly matches 200-weight fleece, and 200-plus GSM wool is like 300-weight fleece. In every instance, wool is warmer because it's better at trapping heat, especially in the wind. (That said, there are reasons to go with fleece at times, like how incredibly lightweight it can be.)What Is Nuyarn?Nuyarn is a merino wool/synthetic hybrid weave, in which merino wool is wrapped around a nylon core for warmth, lightness, and extra durability. The idea is to get the temperature-regulation benefits of merino while adding some of nylon's longevity. In my experience, Nuyarn mostly works. It's our top pick for base layers, though I find it less necessary in more casual garments, where I prefer 100 percent wool.How to Care for Merino WoolMost merino products have care instructions that say to wash them in cold water and lay flat to dry. The latter is important, as hanging wool to dry will stretch it out (because of the water weight). While most merino labels say the garment can be machine washed, my experience has been that hand-washing w