Therm-a-Rest Trail Scout Mattress Get Started Outdoors: Provides the essential comfort you need at an exceptional value. Portable Comfort: Exceptionally compact, allowing you to take it anywhere. Lightweight: Weighs just 1 lb. 6 oz. (630 g) for a 72" (183 cm) mattress. Self-Inflating: Expanding foam core self-inflates; top off with just a few breaths for personalized firmness. Monolithic Core: The Trail Scout uses a uncut foam core to extract the most warmth and support possible