User Review: Therm-a-Rest UltraLite
Price Paid: not sure
This is exactly what is claims to be. It is an ultra light self inflating pad that is perfect when it's not too cold and light weight is the biggest concern. I've used mine for two full backpacking seasons. It is only about 3/4 inch thick but very comfortable. It weighs less than a pound (mine is the 3/4 length version). I fold it in half and then roll it up to just larger than a nalgene bottle. I overinflate it but it has been very durable and supports my 220 pounds without any damage.
For extra heat insulation and comfort I sometimes combine it with a full length Z-rest. Together still under 2 pounds. The UltraLite was replaced by the similar ProLite 3 just after I purchased it.
I think the ProLite 3 has better thermal insulation and a full length ProLite 3 MIGHT eliminate the need to add a Zrest (not sure).