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The circumference of the Regular size vivosmart HR is designed to fit wirsts that are 137-188 mm and the X-large size is designed to fit wrists 180-221 mm.
Sorry, there was a problem. Please try again later.I have a 7.5" wrist and it could easily accommodate another 2" more. So, my answer would be 9.5"-10" for the large size.
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