The Synmat 7 has a heat resistance value of 4.9. At about the same weight a standard 2.5 cm self inflating mat only offers a R-value of 2.5. EMPA tests demonstrated that regular mats lose 3x more heat to cold ground than to the air. The conclusion is that a warmer mat is more important than a warmer sleeping bag.
The SynMats do not reach the insulating properties of the DownMats but offer the same comfort, low weight and compact packed size. They come at a lower price point as synthetic fiber is cheaper in cost than the goose down found in the DownMats. The weight to warmth ratio is far superior to standard foam filled sleeping mats.
The synthetic microfiber filling is laminated to both upper and lower sides of the mat which eliminates the loss of loft common to synthetic filled sleeping bags. As with the DownMats, lab testing was done at EMPA.