I made a similar system with a DIY TQ out of some lightweight polyester fabric and 3/8" poly batting. Then added a fleece liner sewn to the same dimensions. The 3rd piece is a windbreaker over cover of polyester. Togeather it has gotten me thru the mid 20's along with polypro UW. For most of our hangs down here in Florida I leave the fleece at home and am good down into the 40's. Down would be nice but some have to except what's available.
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