Helmets
RD,
The SPH-5 is a model of Gentex helmet.
I feel a helmet is a good idea for helicopters for the following reasons:
1. Bird strikes,
2. Bump and scratch protection in survivable crash events,
3. Ditching when you need to stay consciuos to effect your own egress, and
4. Added noise attenuation (particularly when combined with CEP) over a headset.
Cheers
SM