Practical foam mattress, which attempts to reconcile conservation of heat and light weight: there happens quite well. Compare the characteristics (size, weight) of the Ridge Rest mattress Ridge Rest Solar SOLite the Therm-a-Rest site to find the one that suits you. Measuring 1m88, it suits me well, my feet do not exceed, unlike my old mattress, which helps keep them out of contact with the cold ground. I have tested in the mountains in the snow last winter by about -10 ° C when the temperature is not too extreme, it is well suited for this type of use, by limiting the conduction of heat body to the ground. Only negative: the aluminized coating is used in repeated use, letting appear the green color below.