Also, I would like to add that the thicker the pad, the better the insulation from the ground is going to be. And it is helpful not only in cold weather (very helpful, actually) but also when it is really hot. I crossed the Mojave Desert, and I realized how nice it was to have a 2-inch pad. There was SO MUCH heat coming out of the ground, it was insane. No wonder they have the "sidewalk egg-frying contest" on Oatman, AZ!