This is NOT  a costume hat. This inspired version of Breaking Bad's Walter White Heisenberg hat features 100% wool felt, 1-5/8" brim and 1-1/2" ribbon band.  XL: Hat Size; 7-1/2" - 7-3/4": Head Measurements; 24". To figure out your hat size, measure your head with a tape measure about a half-inch above your eyebrows and 1/8" above your ears where your hat will rest. If you don't have a tape measure, use a string and measure it against a ruler.