The Exped Synmat UL M is the Medium sized version of the incredibly popular ultralight and super compact Synmat that offers warmth and comfort Next-to-skin comfort and anti-slip GripSkin honeycomb-pattern coating Laminate is air tight and impervious to hydrolysis Clever Pumpsack included The Schnozzel Pumpbag allows you to inflate the mat instantly while preventing humidity from your breath affecting the insulation It also doubles as an ultra-lightweight compression stuffsack Proven FlatValve Technology separate inflation and deflation valves non-protruding and more durable than traditional valves