I had been using a Polar FT4, which is a chest strap with a watch monitor. The watch has now gone to seed after many years of service. I want to find a chest strap monitor that works with a watch, other than an Apple watch -- too expensive. Preferably waterproof.

I want the chest strap monitor and watch combination because in colder weather I can't wear a watch directly on my wrist and see it beneath gloves. But what I can do with the watch is wear it around my neck on a cord, and grab it easily to see it. But that only works if it's measuring my heart rate remotely through the chest strap.

It seems like the inexpensive smart watches do not work with Polar or Garmin chest straps. Does anyone know of one that does?