The Therm-a-Rest NeoAir UberLite Sleeping Pad - The Therm-a-Rest NeoAir UberLite Sleeping Pad is for those who have a commitment and need for the lightest gear around. Alpinists to thru-hikers now have a new standard for ultralight comfort with the UberLite. Weighing just north of half a pound, it's the lightest insulated mattress available.