We have a few simple instructions to make sure you measure your head properly and purchase the perfect sized hat for YOU. You will need a cloth tape measure. It also helps if you have assistance from another person to ensure accuracy. We recommend using a metric ruler and measuring your head in CM.

ATOME Sizing

(S) 57 CM : This is our smallest size in most styles .

(M) 58 CM : This is our medium size and is for an average sized head. This is the size we recommend as a ‘standard’ or ‘average’ fit.

(L) 59 CM : Is for a large head. This is our new standard size L and is the largest size.

Quick Tips
There is no such thing as an overall correct fit. You must ensure your hat fits the way YOU want it to. It is entirely a matter of personal preference and whatever feels right to you. A tighter fitting hat stays on better for people who are active – think a festival or day at the beach, your hat will also sit higher on your head. A looser fitting hat is more comfortable to wear for extended periods of time (4+ hours) and will sit lower on your head.

Hat Sizing Chart

US HAT SIZES1/81/43/8
HEAD MEASUREMENTS22 1/822 7/823 1/4


Check the sizing tag on a hat that you already own that fits well. Then using the Hat Size Chart below, convert the size on the tag to a measurement on the table. This will help to determine the size of your hat.