"The yarn this hat is made from is a mixture of wool and nylon. It's a light hat, good for autumn, or more temperate climates. Unstretched, this hat measures 16\" around, stretched, it goes to about 22\". My mannequins head is a little over 20\" around. The hat's height is 7\". I LOVE knitting hats! Especially with luxury fibers! I've made so many hats for myself and my family and friends, and just can't stop knitting them! This hat comes from a smoke-free, pet free home, and has been