NEMO calls the Tensor Elite the lightest Tensor, built as a mummy pad. The page lists a 2.4 R-value, 10D CORDURA nylon, a single layer of Thermal Mirror film, and a 240 gram weight.
It is 3 inches thick, with an Apex baffle and a Laylow valve. Prices on the page are $199.95, $229.95, and $259.95.
Shortlist reason: NEMO lists a 2.4 R-value, 10D CORDURA, and a 240 gram weight.