Having set up elk camp in the northeastern mountains of Oregon on a number of occations for some fairly old guys that could not get off the ground if they tried, I usually provide cots. In the fall, I pick up for a song new lounging cushions that are three to four inches thick. They come with ties that keep them from sliding off the cots. Coupled with a good sleeping bag, they have been comfortable down to way below zero temperatures. The cots give them room to store their belongings underneath and I can get more people into a twenty foot tent. The cot cushion combination is vary comfortable, much more so than sleeping on the ground.