The stainless steel tracker holder is thoughtfully designed to keep it securely in place. Don't lose it like with the straps that come with Vivofit. The added benefit of a woven nylon strap has two advantages over the thick silicone strap that comes with your tracker. 1) The nylon is breathable so the skin underneath is healthy. 2) The strap is a buckle system so it is easy to put on and take off. I can do it with one hand instead of fiddling with the silicone strap's unreliable locking and pivoting mechanism. I highly recommend
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