Hats typically use two sizing systems. One is the one-size-fits-all of adjustable snapbacks, beanies that stretch and other silhouettes with a bit of wiggle room. The other, more common at Hats in the Belfry, is a number system calculated on the circumference of your head. These sizing systems often end at a 7 5/8. Unfortunately, for individuals with bigger-size heads, a seven is just too tight, and a one-size-fits-all hat has never actually fit you. That's why Hats in the Belfry offers a selection of big hats for big heads that includes XXL and XXXL sizes for men.