Had a run, cycled and showered with the strap, and wore it for more than 16 hrs without break.
And up to now it is more comfortable to wear than a regular strap, when tight enough to ensure good readings, and measurements have been excellent. So it has been a really good recommendation (for me). How durable the strap is? Don’t know. It looks really good, but after such a short time nothing else should have been expected