It is recommended to always go a size above your t-shirt size. For example: if you wear our M-40 t-shirt, then choose M-42 hoodie/sweatshirt. To verify the chest size, measure the hoodie/sweatshirt from armpit to armpit laying it flat. If between sizes, always go a size above. Sizes might occasionally differ within a range of plus or minus 0.5 inches.

All measurements are in inches.