This tam is made from undyed brown Romney wool, Corriedale wool and tussah silk.  The red and  gold stripes and green popcorns around the top are all tussah silk.  The diameter is about 10 1/2 inches at the widest point.  The wool yarns are spun medium bulky weight, so this is a nice warm hat for colder weather.  Soft, comfy and cute, too!