The Under Armour site makes it clear that Heatgear is for when it's hot. For cold weather, they have Coldgear.

I made a mistake and bought them for winter. They are indeed relatively thick but my feet sweat and then I get cold.

The even bigger confusion? Someone had brought me UA socks for winter from abroad, and it was like I had a radiator on my feet even in the snow. But I can't find them anywhere... Go figure...

Use in work (constantly) with military boots, use in everyday life with almost all my shoes, use in exercise and not only I have no complaint, but of course I bought them again!!!! No fuzz, no smell, no tearing like alllll the Nike and Adidas socks I have.... I really wonder about those who say they didn't like them, maybe they got defective pairs, I don't know....

By far the worst thing I have ever worn, you feel like your foot doesn't breathe at all, it sweats and honestly my feet have never smelled after exercise except with these socks. STAY AWAY

With the first use, they started to fall apart from the bottom. I used them for aerobic exercise. They don't compare to Nike and Adidas that I use, I didn't expect that. Now, if you use them for athletic activities in shoes, they are good. I will never buy them again.

The material seems to be of good quality, I wear them for running and the gym, they breathe relatively well and are quite warm. Satisfied with the purchase, I will definitely choose UA socks again

Very good quality, soft, durable.
Perhaps the only downside is the tight elastic.
I have them in white and black

For so many years, even in the summer, my feet never felt like they smelled with moccasins..well, I experienced it with these socks. I really don't know how they managed to do it.

I had read reviews about this product that helped me make my choice. Indeed, these first few days I am satisfied. I use it at home and my problem is cold feet. For now, these socks manage to maintain a fairly satisfactory temperature in my feet. I always used HANES socks, which are the best for me, but because it is difficult to find them, I chose these ones, for which the first impressions are positive. I wear size 43 shoes and I chose size 42-47, which fits well on my feet. Given that they have an elastic band on the instep, they can give the impression that they are a bit tight. I think for someone who uses size 44-45 shoes, they may be narrow, so it is better to get a larger size. I cannot comment yet on their durability after washing since I just bought them

All the reviews for these specific socks are valid and I highly recommend them as well. Generally, UA produces top-quality clothing, so feel free to get them without hesitation.

The socks are perfect for my taste, they are quite long, a bit tight, quite thick but they hardly sweat at all, they are not only for sports but also for everyday use and they withstand washings. I highly recommend them if you like socks with the characteristics I described!

Very comfortable and perfectly fitting, they keep your feet dry even during intense activities!!

The best athletic socks I have worn. They keep the feet dry and are particularly comfortable. Highly recommended