(Just the hood, not the whole getup). Keeps shavings out of your ears, hair, and shirt collar. The material is durable and the elastic around the face stretches a little permanently after being worn a few times, making it very comfortable.
You can get a pack of 50 at Amazon for less than $20, a lifetime supply probably. (And, no, I'm not selling them or a shareholder in 3m or whatever, I just like them). The only downside is that you'll probably end up looking like a homely nun while wearing it.
https://www.amazon.com/gp/product/B00AFEDNR8