great construction as usual, I love beanies but once moving fast typically overheat in them. this one so far I have been able to wear 90% of the time, instead of the typical 50% or less. overall an excellent all around beanie, my new all time favorite. the wool helps regulate temp without being overly hot or bulky. I was excited when I saw in the reviews it ran a bit small, as I have a small head and most headwear does not fit me properly. however, the only downside to this thing is it is even small for me. fits "snug" on my small head, even a tiny bit tight though I expect it to stretch and break in a bit more still. if you have a medium to large head this will probably not work for you.