In reply to DancingOnRock:
> Yes.
> If you’re considering wearing them at races get bone conducting ones.
> 11 people were DQd in the last race I ran.
For info;
Headsets are banned for all athletic competitions (and indeed warm-up areas !) mainly for the simple reason that the wearers cannot hear anything else, and as such could either run into something (or someone), or be run into themselves. There have been a number of accidents before this ban, some involving ambulances taking the victims to casualty with broken bones !
Whatever you do with a headset for training ensure that you can still tell what else is going on, or you'll be like the clown who stepped out in front of my motorbike two weeks ago (a Royal Enfield with an almost straight through silencer, so god knows how she couldn't hear it !) She was lucky that I was only going 10mph at the time.