This is the third time I have ordered straps from them and have always ordered a small size. I really liked it the first time, cool. The second time around they were a little loose but worked well enough, the Fitbit just slipped a little. Last time I ordered a large pack of the "small" size and they are so huge that the Fitbit doesn't stay on my wrist and there is about a half inch of space between the strap and my wrist. I'm not sure why their sizes are so different, but definitely be careful.
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