We're using a universal hat size chart. Here are some tips on how you can find your perfect GEMSUN one hat fit:


Use a flexible measuring tape to determine the size of your head correctly. 


Measure your head on its largest circumference which is usually above the eyebrows.

Use the list below to match the length of your head circumference to our hat sizes.

If you fall between two sizes we recommend to choose the larger one to ensure a comfortable fit.

Please remember: hat sizes vary from brand to brand and region to region. Since all our GEMSUN one hats are being handmade with love, there might be some small variations within the size ranges.

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We're using the below size chart for our flip flops.

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GEMSUN vintage

As our vintage products are sourced from different parts of the world and eras, please note that the marked sizing is not always exact.

Please get in touch with us at if you have any questions regarding sizing and we will send you measurements.