The ALPS Mountaineering Swift is an extremely lightweight insulated air mat weighing in at mere one pound five ounces. 

Features:
Extremely lightweight
Small pack size
R-Value: 3
Small, pillow-like air chambers provide extra support and comfort
Flat valve allows easy inflation and deflation
40D nylon ripstop fabric
Stuff sack and repair kit included specifications

Specs:
Dimensions: 75" x 22" x 2" / 190cm x 56cm x 5cm
Packed size: 10" x 5" / 25cm x 12cm
Weight: 1 lb. 5 oz. / 595 grams