Body-mapped anti-compression pads

How is it possible that the down-filled sleeping bags of North Face® offer up to 13% more thermal efficiency than other bags? The Summit and Core Down collections feature Climashield® Prism continuous filament synthetic insulation in those areas subject to the greatest pressure, which are in contact with the ground most often (head, torso, feet). These pads, which are ergonomically designed and contoured and have anti-compression properties, create an insulating base between you and the ground. They are also more resistant to compression than the down filling.