The exped synmat ul lw is the long and wide 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 flat