Description of Therm-a-Rest Prolite 3 Air Mattress Short The lightest, most compact mattress ever. Features: Uses: Engineered for 4-season backpacking, mountaineering, bike camping, and boat touring. Ultralight: Innovative new materials reduce weight by 25%. Compact: Die-cut foam allows for smallest roll size ever. All-Season: Thick and warm enough for winter camping. Weight: 13oz.(370g) Dimensions: 20x47x1in.(51x119x2.5cm)