Blacklist Hat by Von Boch, Medium Wool Imported Medium: Hat Size; 7 This is NOT a costume hat. This Blacklist hat by Von Boch features 100% Australian wool felt, a silk crimson liner, an interior cotton sweat band, 2" brim and 1-1/2" ribbon band. Also available in Large and XL To figure out your hat size, measure your head with a tape measure about a half-inch above your eyebrows and 1/8 30 Day, no fuss, return policy and the first size exchange is free.