Nike Fisherman Beanie
Here's what other sites are saying:
The top of your head is like the chimney of your body. All of that hot air that you work so hard to make just gets sucked right off the top of your head and into the air where is doesnt do a bit of good to anyone. Keep that hard-earned heat in with the Fisherman Beanie from Nike 6.0. The only other way to keep that heat in is to grow your hair out and pile it on top of your head in a twist.