Excellent

Liwithpro

Open Ear Wireless Bone Conduction Headphones Liwithpro Bluetooth Folding Sweatproof Earphones Sports Headset with Microphone and Volume Control for Cycling Running Gym Black

This is the third pair of bone conduction headphones I've used,  and the best. Other brands seem to mostly rely on a speaker in front of the tragus that relays most of the sound. These actually oscillate the bone effectively, delivering quality sound. 
I like that these headphones stimulate the cochlea directly, leaving the ear canal unimpeded. This makes them safer to use than earbuds or over the ear headphones, as outside noise is still heard. This lesser attenuation of outside noise makes these headphones perfect for biking, hiking, and running. 
I very much recommend these. They would also be great for custom hearing aid users, as feedback would be much less compared to circumaural headphones. 
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 https://www.amazon.com/dp/B075SFDS93/ref=cm_sw_r_cp_apa_jI4lAb7S7Q9B6