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Air mattress. The Ultra Light Range consists of a single-layer (single-layer) construction of medium resolution and is therefore one of the lightest sleeping mats with the smallest pack volume, which still has the convenience of the Sea to Summit Air Sprung Cells. Dimensions: 168 x 55 cm. Rolled size: diameter 7.0 x 17 cm. Weight: 345 g. Thickness: 5 cm. R-value: 0.7 (warm nights). Number of air jump cells: 174: air jump cells. Cell Tetechnology is the reason why you sleep better on Sea to Summit sleeping mats. Instead of a typical divider construction, Sea to Summit sleeping mats are equipped with a point-welded construction of interconnected chambers that form a large matrix. These chambers are called "Air Sprung Cells". Air Sprung Cells work like pocket spring mattresses, each chamber deforms independently, allowing the mattress to adapt to the body shape. This