this bonnet is crocheted from a blend of 65% alpaca and 35% acrylic yarn. it is handmade with crochet and one of a kind! it should fit most head snuggly, it is a bit stretchy. this one does not have ribbing around the face, which is a bit of a different design than usual but still cute and functional! if you buy this please do not put it in the washing machine :-) that would be sad.