These are the Vidonn F1 Titanium Open-Ear Headphones. Using Bone Conduction Technology they are targeted at fitness and outdoors pursuits. They connect to your device using wireless Bluetooth technology and feature a built in Microphone for calls and commands.

Features from Amazon:

Outdoor Sports Safer: Bone conduction technology for F1 Titanium, open ear design allows you to hear the world around you, making running, biking and driving safer when you enjoying the music.

Comfort and Convenience: Titanium wraparound headband is lightweight and flexible for durability and portability. Light in weight determines the highly comfortable feeling when wearing. And comfort is not compromised when you have your glasses on.

Multi-functional Technical: iP55 certified to repel sweat, dust and moisture from workouts to wicked weather , endure all other wet situations except shower or swim.

Multi-functional Technical: Vidonn F1 can offer 6 hours of continuous music or call time only need charge for 2 hours and can standby 20 days. Compatible with iPhone, iPad, Apple Watch, Android phones and fits Bluetooth 4.0 and after.

Bone conduction technology delivers music through your cheekbones, ensuring ears remain completely open to hearing ambient sounds.

You can grab a set off Amazon here – price at time of publishing £75.99.