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The ground may be hard and cold, but the small Prolite Self-Inflating Mattress  from Therm-a-Rest offers a comfortable place to rest in a lightweight, pack-friendly package. Weighing just 11.5 oz and packing down to 11 x 3.3", this self-inflating, firmness-adjustable mattress features diagonal foam construction for an insulating R-value of 2.4. Simply unroll it and open the valve to allow the foam to self-inflate, then add a few breaths for firmer support or squeeze a little air out for a softer feel. The Prolite measures 47 x 20 x 1", is filled with urethane foam, and constructed of 50 denier mini Hex Rip polyester fabric.
Self-inflating pad can be adjusted for desired firmness
Diagonal foam construction yields R-value of 2.4 for insulation in cold conditions