At first I misread this as "hypergolic" and had concerns. The actual thing is much nicer, and the description of how to get the curved seams right was helpful. This is something I've never quite figured out but I'd like to get a lot better at it.
To be fair, a hypergolic blanket would still keep you warm. Potentially for the rest of your life!
do not fold the hypergolic blanket!
I can't work out if this website is being hugged to death, or if we need to sponsor the owner a new router. The images take forever to load for me