Some new travellers feel that their sleeping bags are already very thick and the tents are also very tight. Can you omit the sleeping pad? Let me talk about the answer first. Outdoors, if you want a sweet sleep, the sleeping mat provides two important functions: cushioning and warmth. Although on the surface the sleeping pad is a comfortable surface for you to fall asleep, its ability to keep warm is more important. There are four ways to lose heat from the human body: evaporation, convection, conduction, and radiation. Among them, conduction and convection dissipate the most heat, while lying down while sleeping, the heat loss from conduction accounts for the bulk.
If you sleep directly on the ground outdoors, the result is that no matter how thick a sleeping bag is wrapped, you will feel cold, because the ground is constantly absorbing your heat. There is a large loss of heat, ranging from weak action on the second day to direct loss of temperature at night.
Foam cushion-keep warm through numerous small airbags inside the tight closed-cell foam material.
Inflatable cushion-artificially construct an air bag and fill it with air to keep warm. Some models will fill the airbag with other insulation materials to further enhance the thermal performance.
Self-inflating cushion-a combination of foam cushion and inflatable cushion, using the expansion of open-cell foam to achieve self-inflating effect.
