Here's a review that will help you. It's not really silk weight, it's more like underwear material. It's like wearing underwear on your head. It is a little tough to breathe through despite the fact that it is pretty thin material. I've worn it twice cycling in 35 & 40 degree weather. It kept my head and neck warm, and that's what really matters.

Is it the best? No. Is it worth $10? Yes. I may even buy 2 more so I can just toss them in the wash and have a clean backup.