Walter White Heisenberg Hat, Size Large Imported Large: Hat Size;7-1/4 100% Australian wool felt, 1-5/8 Also available in Medium and XL 30 day, no questions asked, return policy. Free shipping on first size exchange. This is NOT a costume hat. This inspired version of Walter White Heisenberg hat features 100% Australian wool felt, 1-5/8" brim and 1-1/2" ribbon band. Large: Hat Size; 7-1/4" - 7-3/8": Head Measurements; 23.25". 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. Free shipping on first size exchange.