If you don't know your hat size, you only need half a minute to measure! Using a string or soft tape measure, wrap it around your head, starting in the center of your forehead, 1" above your eyebrows.  Run the measure all around, making sure to align it with the widest/deepest part of the back of your head. That's it! Compare the circumference with the chart below (if you used a string, you need to run it along a tape measure to get the figure) and order accordingly.  Fitting your size in an XS to XXL scale is not precise, as this scale is meant to fit as broad a population as possible.  Match your measure to the closest available size. We recommend you "size up" if you fit between measures!

SIZE NEAREST METRIC CANADA U.K. FRENCH 1/8" SIZES U.S. SIZES SIZES X-Small 20 1/2 52cm 6 1/2 6 3/8 2 1/2 20 7/8 53cm 6 5/8 6 1/2 3 Small 21 1/4 54cm 6 3/4 6 5/8 3 1/2 21 3/4 55cm 6 7/8 6 3/4 4 Medium 22 56cm 7 6 7/8 4 1/2 22 1/2 57cm 7 1/8 7 5 Large 22 5/8 58cm 7 1/4 7 1/8 5 1/2 23 1/4 59cm 7 3/8 7 1/4 6 X-Large 23 3/8 60cm 7 1/2 7 3/8 6 1/2 24 61cm 7 5/8 7 1/2 7 XX-Large 24 1/8 62cm 7 3/4 7 5/8 7 1/2 24 7/8 63cm 7 7/8 7 3/4 8