Therm-A-Rest NeoAir UberLite $599.99
Used by: Newsletter editor Justin Sprecher
Used for: Four months
At 250g, this mat is one of the lightest inflatables out there.
It has an R-value of 2.0 and doesn't contain any insulation. I've used it down to 5° and was comfortable, but only just. Therm-A-Rest also uses thin, almost