I am very interested in the results of this poll. I'm thinking of getting one of the Big Agnes bags and need to know when to switch from one of their 15 degree pads (recommended with the 15 degree bag) to carrying a thin closed cell foam layer to add insulation.

I currently use a 10"x10" square of closed cell foam pad cut from a old sleeping pad as my "butt pad" so I can sit in comfort while having lunch or on sit down breaks on day hikes for only a few ounces of weight. And it is such a bright yellow-green I can't leave it behind when I pack up!