One size fits most hat, the mannequin head is on the small side. 
Mixed yarns like cotton, canadian wool and viscose, hand washable cold, dry flat. 
I like to randomly crochet up my yarns and each hat will be different. Feel free to ask me to make something for you in different colors or check my other one of a kind options.
These hats have an extra layer of warmth due to the color put on top of the base hat.