Hi @dezim8er
From the Fitbit Article
The Zip is not designed to be worn in direct contact with the skin. Always use the silicone holder when clipping it to a bra or waistband, with the display facing outward. Do not wear the Zip inside your bra.
Some users may experience skin irritation even when wearing the Zip as instructed on the bra or waistband. If this occurs we recommend clipping it on your pocket, belt, or other external piece of clothing.
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