Seems pointless and inconvenient for me as they usually seem to be poor quality, and can you really listen to music in the shower, and are you showering long enough to benefit from it?
Or do you own one and use for a different purpose, like swimming or Kayaking?
If you’re in nature to enjoy nature, leave your music at home. No one wants to hear it but you.
And open ear headphones are different from open headphones. Open ear headphones are basically ear buds that don’t go into your ear canal, but direct music into it.