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About 3mm. Normally, you can use some heat to bend the arms of Wayfarers in or out to make them more comfortable. The technology in the glasses doesn't allow the heat/bending. So, it helps to buy the right size. If glasses at the store tend to be too tight (and you have to bend the arms) buy the bigger size.
Sorry, there was a problem. Please try again later.The size. If you select size guide, it will tell you the measurements for both
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