The Sea to Summit Ultralight Air Mat – Regular provides the lightest and smallest packed size mat without compromising on comfort. Ideal for hiking or travelling light, the mat is still comfy at 5cm thick and has an R-value of R0.7. The air sprung cells are the core technology of the Sea to Summit range and are the reason why you will sleep better on a Sea to Summit Sleeping Mat. Rather than typical baffled construction, Sea to Summit sleeping mats are constructed using a dot-weld pattern to create a high surface-area matrix of interconnected chambers called Air Sprung Cells. Air Sprung Cells operate in the same way as a pocket spring mattress. Each cell is independent so the mattress conforms to your body shape. This is more comfortable as is disperses weight more evenly!