The Aerostat 9.0 is a synthetic filled sleeping mat designed to offer the highest levels of warmth, exceptional comfort and a small pack size. With Exped patented construction the Aerostat Synthetic 9.0 Mat uses durable 30 denier Nylon ripstop fabric and robust welded construction. It comes with an insulating R value of 4.0 suitable for year round backpacking and mountaineering.With a self-sealing Gas Mask valve providing a two-way system for inflation and deflation of the mat it's easier to use. Repair patches are supplied with the mat, handy if the mat gets damaged. Aerostat Synthetic 9.0 Sleeping Mat - Long/Wide