Ultralight insulated air mattress provides a warm and comfortable sleeping surface for late spring to early fall (3.1 R-Value) backpacking, adventure racing, and bike touring Air Sprung Cell construction mimics a spring mattress, maintaining more body contact area and even dispersion of pressure for restful backcountry slumber Multi-function valve for fast inflation in just a few breaths (using integrated Airstream Pumpsack), one-way deflation for quick packup, and fine-tuning of air pressure Insulated pad features high-loft fiberfill and reflective fabric, to prevent heat loss and radiate heat back during sleep; non-slip 30D/40D nylon face fabric is durable and quiet Large size measures 78 x 25 x 2 inches, packs to 4 x 10 inches, weighs 1.3 pounds; includes stuff sack, field repair kit, and PillowLock patches for securing a Sea to Summit pillow to mat