New fabric choice at Ripstop by the Roll.
I am thinking that this product might be a good choice for a sleeping bag liner to wick away body vapor and help to keep down sleeping bag interiors cleaner.
Polartec® Alpha® Direct with Wool 4048 @ $30.00 /yd which (from RSBTR)... Polartec code 4048, and this fabric is a mix of 63% Polyester, 33% Wool, and 4%Nylon.
By no means a Vapor Barrier, so perhaps 4-yards of this might be the cat's meow.
https://ripstopbytheroll.com/product...43135544590506
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