I ordered two of these "blankets" - they only cost $10 each but they charge $10 each for shipping from Texas to Buffalo - which I thought is a little unreasonable.
But I bought them anyway to try it I the hammocks. Supposedly they work like a space blanket but havie "microscopic" perferations for breathability and are "washable". They are trying to promote the material as usable for making clothing. If it doesn't work in the hammock or as a plain warming blanket on my bed, maybe I'll make a tuxedo out of it.