Archaic AFFLICTION Men THERMAL T-Shirt ACHILLES Tattoo Biker MMA UFC Men's Sizing Chart Width (Measured from 1" below arm hole) S-19.5 M-20.5 L-21.5 XL-22.5 XXL-24 XXXL-26.5 XXXXL-28 Length (Measured from the top of shoulder where it meets the collar) S-26 M-27 L-28 XL-29 XXL-30 XXXL-31 XXXXL-31