Super soft silicone. Straps in 3 different sizes come in handy as your child grows or you have several children of different sizes. Hardware keeps falling off and so does my son's Vivofit JR. falls off unexpectedly. Luckily we didn't wear it outside so we still have vivo. I foresee it being easy to lose on the playground when I send it to school in it. We will try other groups to see if we have the same problem. For the price, I agree that one will be rejected, but not all three.
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