100% Merino Wool Base Layer Mens - Long Sleeve Thermal Shirts with Socks

I’m extremely satisfied with the Merino.tech Merino Wool Base Layer – Men’s 100% Merino Wool Long Sleeve Thermal Shirt. The material is outstanding — soft, breathable, and genuinely warm without feeling bulky. You can immediately tell it’s high-quality merino wool. The fit is excellent and true to size. It sits comfortably against the skin, layers perfectly under jackets or sweaters, and doesn’t itch like lower-grade wool. The craftsmanship and stitching feel durable and well made. Delivery was fast, and the product arrived exactly as expected. If you need a dependable cold-weather base layer that performs and feels premium, this is a great choice. BUY NOW!!!!

It is true to size, super warm and comfortable without being bulky. I bought it to layer for our hikes through the Tetons last week. It's ideal, the best, Jerry, the best!

So I decided to buy a medium weight base layer set for work. I drive a truck in New England. Didn't realize at the time that I bought the bottoms and top from different companies, But whatever, this review is for the shirt. It arrived late Dec. and I immediately put it on and loved it. Absolutely loved how it fit, felt, looked, etc.. wore it all that day at home and then all night under a sweater. Perfect.. I work 4 days a week and I wore it everyday for work. Only washed once per week and never dried in a dryer. Like I said I drive a truck so it wasn't abused or worn under harsh conditions. Breathable, soft, warm, comforting, literally everything good about an article of clothing and what you want it to do. Especially in the freezing cold weather. Come early March I washed it as usual on Sunday and when I took it out of the washing machine I noticed that both armpits had come unsewn along the seams. So weird. Not happy because it's still freezing out and I really love wearing it for work, And it's only been a bit over 2 months of owning it. I take a few pictures and decide to email the company about two weeks later. Send an email explaining my dilemma, attach the pics, and get a response the next day asking for an address on where to send a brand new shirt along with recommended care instructions on how to wash and dry from a very helpful woman named Julia. It came a couple days later and I immediately put it on and I'm back to being happy! I will absolutely be buying the lighter base layer for Fall this year. Thank you Merino.tech!!

5/6/26 update This company has incredible customer service. I am updating my rating from 3 stars to 4 stars. In addition, I forgot to mention in my original review, when you purchase a garment from this company, like a shirt, they include a free gift, like a pair of socks. A pair of 100% merino socks, for free ! I feel like this company really does try to make their customers happy. 4/27/26 Summary: It is a great shirt, but is not very durable. Develops fabric runs only after about 6 month. It is actually 3 months, considering I wear it only half the time. I really like this shirt. It is light enough to wear most times of the year and it has all the wonderful qualities for which merino wool is loved: warm, but very breathable, comfortable, protective, and natural. But it develops fabric "runs" all too often. For example, I bought one shirt on September 6th. By October that shirt was exchanged because it developed a run. I had bought a total of two of these shirts, one in late August and another was replaced by early October 2025. And I basically am wearing one of them all the time. When one of them gets dirty, I just swap it for another one. Well, it is 4/27/26, and one of them has developed a run. Actually, this shirt had already been repaired a month or two ago. So from about late August or early October, average to mid September 2025, to about late Feb or March, average that to early March 2026, which is about only 6 month, it had to be mended, and now by late April, it needs mending again. I have to say that despite a great idea/design and very competitive price, the quality is deficient. Because even if it is priced very competitivly, if you only buy it for 6 month, it turns out to cost too much. One might say that it is because of such light design is why it is more fragile. And definitely it is a factor. But I own another merino garment which was bought around the same time, and which gets just as much wear, and it is holding up just fine, so far. So I still think that there is a quality issue with these shirts, and this company.

I recently purchased this base layer and I’m honestly very impressed. The material is thick and high quality. You can immediately feel that it’s not cheap or thin like some other base layers. I took it with me on a trip to Armenia where it was snowing heavily and temperatures dropped to -10°C. This base layer kept me warm the entire time. No complaints at all. It fits comfortably, doesn’t itch, and feels great against the skin. It’s warm but still breathable. I even wear it to sleep sometimes because it’s that comfortable. Cold-weather base layer that actually works, this is a great choice. Highly recommend.

My first merino clothing. I hike year round and was having sweating issues in the winter from the layers I wore. I have used this shirt 5 hikes now and no sweating. I’m very happy I got this shirt. I bought a Man’s because I am a Tall Woman. It’s nice and long to my Hips and the sleeve are a great length. I also like the red goes great with my winter jacket. Came with free socks. I tried them yesterday, they are comfortable but didn’t keep my feet warm. But no doubt they will be great when it’s not freezing cold. I will check to see if they have thicker ones for the winter as my other socks cause my feet to sweat in my hiking boots. These thinner socks kept my feet dry. I’m thankful for the free socks. I also bought another shirt in a lighter weight and that one is great as well. Also not itchy. I just ordered the pants which will arrive this week. I’m looking forward to trying them out on a freezing cold morning hike. I’ll do a review on the pants purchase after I wear them. I highly recommend merino, it’s made a huge difference on my winter hike. Wish I knew about this product before.

This is a good quality Merino wool thermal base layer. I used it primarily for cold-weather cycling and it performed extremely well. On a recent ride in 20°F temperatures, it kept me comfortably warm without feeling bulky or restrictive. The material seems high quality, well-made and durable. It has a fine, thin feel without being see-through. The black color also matches pretty much anything, if that matters. The set also includes a pair of wool socks that match the quality of the shirt. They’re warm and well made, though a bit too thick for cycling shoes in my case. They’d probably be great for general winter wear or other cold-weather activities. Sizing runs true to size. If you prefer a race-style clinginess for layering under cycling gear, you may want to consider going one size smaller. Overall, this is an excellent base layer for cold conditions, especially for winter cycling.

The shirt quality and fit are as described. This is a good light base layer.

Pour me protéger du froid, j’ai choisi ce maillot de corps. Il n’y a que la laine mérinos pour nous protéger vraiment. Ce teeshirt est sur, fabrication hautement résistante et belle. À recommander vivement.

La 165g non è così sottile come mi aspettavo, ma la maglia è molto bella e ha un buon rapporto qualità prezzo, morbida al tatto. Presa da regalare, ancora da verificare la vestibilità.

Mám již několikáté a jsem velmi spokojený

I purchased this with some hesitation due to merino being an expensive buy. I needed this as a base layer for a cold hike in the mountains, and was pleasantly surprised 1. Thin enough but not too thin 2. No threads sticking out of the seams - seems well stiched 3. Super comfortable - does not make me itchy like some wool does 4. Very absorbent and quick drying - and does not smell at the end of a long day (or two) 5. Excellent colour (partial to yellow, and what a yellow this is!) 6. Bonus freebie of a pair of socks which are also great! Overall, happy with my purchase - seems durable, and first handwash didn't shrink it either. Follow care instructions and it should last long enough, and worth it's value.

Soft, fine and warm