I'm used to the slidey fastener ring with no bumps, which slips out of place as easily as it goes on. This was hard to put on the first few times (I take my Vivofit off during showers - hot water can trump waterproofness). However, it got better with time, and it doesn't slip out of place like the bumpless version. I now have a bunch of these I'll never use, but if I had to order more, I'd probably order this style again vs the no-bump version.
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