bought these for my boys for Christmas in a men's small. They are ages 11 and 7 , with big heads. Originally I had tried a youth Large from another manufacturer, but they would not have been able to wear them for more than 1 season. My boyscout loves the olive green, and my other son has the plaid. They love them, they are very warm too.
In my opinion, all others are cheap imitations. Your Mad Bomber hat is warm and is made with superior materials. I recently bought one from a "big box" store and compared to yours it was a waste of money. I also love the colors you offer.