My helmet was away for servicing and I had to use the spare headset. That was hard work, not only was I hearing loads of creaking noises the ANR and helmet normally filter out but also not being able to use sunglasses without it getting louder coupled with the fact that the sun manages to enter around the rim making it almost pointless of having the glasses.
If I ever leave my current job I hope I can convince my new employer to allow me to wear helmets.