Sizing info: If you don't already know your cap size, take a tape measure and wrap it around the widest part of your head, just above the eyebrows and ears, measuring to the nearest 1/8 of an inch. (Note: Using a friend or a mirror makes this a lot easier. Just make sure your friend isn't sporting a camera - what an embarrassing shot that'd be.) Divide the measurement by Pi (3.14) to get your cap size.

For example, if you measure the head and it comes out to 22 1/2", then divide 22.5 by 3.14 for 7.165 which is just a bit larger than a 7 1/8 Hat.  Then order that size for a snug fit, or the next size for a slightly loose fit.

Stay warm.