FYI
klatre Bone Conduction Headphones, Open-Ear Sports Earphones with Mic, Bluetooth 5.2 Wireless Headset, IP55 Waterproof, Sports Headphones for Running, Fitness, Cycling – Rock
I have these. I like them and have no real complaints except they have limited volume, the battery isn’t amazing and you can’t wear hats that cover your ears. They cost about £100 circa a year ago. Currently they are £30. In my opinion these are expensive headphones for a bargin price. They might be cheap as they are being replaced with a new model an dthese are the dregs of the stock.

Volume is mostly fine but they aren’t going to kick your head in. The battery needs to be re-charged about every three and a half hours.
Thanks for the tip – I’ve ordered a set. I’ve never managed to find a set of earbuds which are comfortable – so when I’m out and about I use over-ear phones. But I’m wary about using them in wet weather and it does limit the available headgear.
These might be just the thing!
When I regularly cycled across town for 20+ mins twice a day, I bought something similar (wired, not Bluetooth). I’m afraid I didn’t get on with them, but they were a lot safer than in-ear cans when cycling.
I don’t really like to listen when I’m on a road but sometimes will when I’m on the seafront. I have a pair of Soundcore earbuds which will operate singly, the one still in the case not being powered up, allowing me to be aware of my surroundings. They are weatherproof and battery life is 5 – 6 hours at least.