Very warm, they "light up" the feet immediately. They have a seam on the back of the heel that hits. Only for narrow foot shape. Good grip, durable, but I wouldn't recommend them. I spent a lot of money on a cobbler to fix the issue with the heel, sticking leather inside so it wouldn't hit me. Unfortunately, it can't be fixed. Money wasted.

They are comfortable and lightweight. I used them yesterday on an easy trail in the forest and they gripped the ground very well. They didn't tire me at all. At some point while going uphill, I felt them to be a little warm, but this has to do to a large extent with the ascent. I ordered the same size that I wear in athletic shoes and it fits perfectly.