I have ordered 2 Callaway t-shirts in size 4XL. One was dark blue and the other light blue. 4xl in light blue fits perfectly in a little more space. The navy blue 4xl is MUCH small! It is best to be XL. Some of them must have some sort of manufacturing defect where the 4xl were mislabeled or something. Other reviewers also had the same issue and said 4xl was too small. I never leave reviews for Revain but felt like I had to because it was so annoying.