Will it keep you warmer than other, heavier stuff? Depends on the stuff. I have a Feathered Friends Rock & Ice Parka that cost $600 and wraps me in about four inches of down-filled air space. My bet is that it's a good four times as warm as the Six-Month, which yields about an inch of insulation. But for $100, and for plenty of people, the Six-Month is all the insulated jacket you need. Just keep in mind that there are limits to what a few ounces of Polarguard can do.
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