Ergon has announced the ElegaBand, a watch band designed to allow you to wear your favourite smartwatch on more places than just your wrist. The ElegaBand will be compatible with the Apple Watch, Samsung Galaxy Watch or Garmin smartwatches and will start at US$99.
https://www.notebookcheck.net/The-ElegaBand-will-allow-you-to-wear-your-Apple-Watch-Samsung-Galaxy-Watch-or-Garmin-smartwatch-in-new-ways.607088.0.html
I see the point in this product, but for the money I would just get dedicated HRM like Polar Verity Sense which is cheaper than this armband and provides very good accuracy on par with classic HRM chest straps and it runs longer than those smart watches that this band has been designed for.
50$ is max what people should pay for this thing, shipped.