These pads are made with a unique high pressure nitrogen gas solution process. High quality extrusions and cross-linking of solid polymeric sheets are impregnated with pure nitrogen gas at elevated temperature and extremely high pressure. Then the impregnated solid sheets are expanded in a huge low pressure autoclave. This process results in an extremely regular and uniform cell structure in the foam.
"The NightLight™ Torso Pad is meant for hikers who have ultralight frameless hiking packs. These packs have an external pocket between the pack’s shoulder straps where you add a sleeping pad. The sleeping pad acts like a internal frame, stiffening the pack." Read Full Review