Synthetic floss silk as insulation

Anyone have any experience with synthetic floss silk as insulation? How is it as an insulator and is there anything I should be mindful of? It is the insulation used in DD Hammock's new underblanket.

Thanks.

i'm eying these underblankets for our family's kit too

i have no experience and am anxious to hear from those w/ more knowledge

in particular, penfold made the comment on the dd underquilt thread he was doubtful it was good down to -5c (23f) and am hoping someone who has used these can comment

is this the same insulation they used for the snugpack uq's?