I do get chilly in camp early/late in the season and can sleep a little cooler than I like. I've never been cold while hiking, well except for the time I got washed down the Moorman's River . . . <img src="/forums/images/graemlins/blush.gif" alt="" />

The more I read, the more I'm convinced that a lightweight down layer will address most my needs. I just can't seem to zero in how light will still be worth it.