These straps fit my Fitbit Alta HR perfectly. They are made of soft silicone, which is quite comfortable as I wear my Alta almost 24 hours a day as I like to track my sleep. They are easy to install and appear to be of sufficient quality. To be honest if you wear it all the time the straps will eventually tear and break which is why a 4 pack makes sense. I am assuming these 4 straps are from last year. A nice and unexpected feature, the single locking loop has a small bar inside that fits into holes in the strap to actually "lock" it in place so it doesn't slip off easily during activity, and holds the end of the strap. I think you can use different colors and change them up every day to suit your mood, but I prefer all black because I want the fitness tracker to be as unobtrusive as possible. The square clasp is also made of black steel instead of flashy stainless steel and is therefore not conspicuous. The strap has subtly embossed diagonally patterned lines that add some texture and visual embellishment to the strap. but it's subtle enough, especially in black, that it doesn't stand out. Overall I recommend them and hope to buy them again if my Alta HR is still running when I need more.
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