Some kind of insulation is essential to prevent heat loss when sleeping on snow or cold ground. Our Rest Pad is closed-cell rubber foam pad which is light weight, water-proof, inexpensive and comfortable and very effective on snow or cold ground. This sleeping mat is made of EVA foam, or ethylene vinyl acetate foam, which is clear, resistant to water, glossy, tough at low temperature, resistant to stress and crack, and resistant to harmful UV radiation. Foam makes the mat lightweight, easy-to-carry, and comfortable. When you are out for hiking, trekking, or camping, you can add this mat to your sleeping bag as an extra layer for a comfortable and sound sleep. You do not need to worry about your mat getting damaged due to folds as it is resistant to crack and can withstand external stress or pressure.