Nicely explained Mark, I actually use the same system but heavier of course, pardon my misinterpretation.
Interestingly it's my legs that normally loose the most heat and why i have been a lifelong fan of half bags
wayno wrote:you have to pick your clothes carefully to get the same warmth as a sleeping bag,
most down clothes are stitch through construction with cold spots. down bags usually have baffled compartment, eliminating cold spots. generally sleeping bags give you better warmth for weight, that few hundred grams of bag can make a big difference in warmth... so you might be hot in a sleeping bag in summer , but ditching it isnt as simple as it seems.... if you think you'll just throw on a couple of items of clothes and a bivy bag to make up for it you may find you still don't get comparable warmth....
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