When I am designing, I like to experiment with yarns and needle sizes. This hat is a prime example of one of those experiments. It is made of sock yarn and the result is a lightweight stretchy cap. It feels so warm, yet weightless. I think the key to this is the blend of fibers — merino, possum, nylon and elastic. This is a finely crafted yarn for the finely crafted cozy hat you are going to make.