Me: Hi Garmin, the strap on my partner's vivosport has snapped.
Garmin: Sorry, you can't get new straps - it's an all-in-one device.
Me: Oh, that's disappointing.
Garmin: I know. Anyway, we'll send you a new one.
Very similar to my experience with Fitbit "Charge HR" and it's ballooning straps... Replaced 3 times or so with brand new devices, before the warranty was over.
Me: Hi Garmin, the strap on my partner's vivosport has snapped.
Garmin: Sorry, you can't get new straps - it's an all-in-one device.
Me: Oh, that's disappointing.
Garmin: I know. Anyway, we'll send you a new one.