As I wrote in another helmet thread a while ago... My helmet is the best ski hat I've ever had. It's warm when I want it to be and cool when needed. It holds my goggles so that I don't have to futz with them all the time and requires no messing with after I put it on. On a long chair ride in the freezing wind it keeps my head comfortable and warm. Does it improve safety? That would be a bonus but it wouldn't stop me from wearing one if it doesn't.