I chose the same pads Lori did, except I got the NeoAir short instead of medium. The NeoAir is for three season use, and the Exped is for winter. Yes, the Exped short is heavy at 22 ounces (versus 9 for the Neoair), but it has an R-factor of 8+ so it's very warm on cold ground at zero. "Light" is a completely relative term, and depends heavily on the conditions you're anticipating for the trip. (Which I forgot to mention in my original post.)