Love this hat - I ordered two more after I received the first one - the material is wonderful - it's extremely soft fleece that feels like velour and it has stretch in it so it stays snug on the head.  It's not too thick or too hot.  In honesty, I'm bald due to a temporary medical condition, and that's why I bought the hats and I like how comfortably snug they stay; fit head perfectly.  I've also worn them over my wigs and they don't feel too tight then at all; stretch perfectly; don't let wind through without a lot of weight.  I bought a Marmot fleece jacket that was $90 (bought elsewhere because was on sale)and it is made of the same material; love that too!!