First, let me say whoever invented the winter sock - pure genius. I just made one from a king size polyester bed sheet I got from Goodwill, and it is working out great.
Last week, I went on a solo over-nighter to test some new DIY cold weather gear and found it to be severely lacking in 28 degrees and windy. Nearly freezing to death got me to rework my gear a little. So far, I've spent about an hour in 32 degrees with a slight breeze and have been absolutely comfortable with only my underquilt and base layers. What a difference the winter sock makes.
King size bed sheet: $3.99
PMI cord: $0 (found)
Cord lock: $0 (found)
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