
Headphones for cycling can be split into two quite distinct camps: earbuds and bone conduction. Typically, bone conduction headphones are better for enabling a greater awareness of your surroundings, as they don’t block up your ear canal and they allow ambient noise in.
On the other hand, bone conduction headphones tend to be quieter and deliver less of a rich sound than the earbud design - which generally represent the best option for riding indoors, as with noise cancellation they can really help block out the noise of an indoor trainer.