The present disclosure provides at least in part a bed cover comprising a plurality of heat insulating chambers having a first surface and a second surface and at least two sidewalls connecting the first surface and the second surface, the width of said first surface being greater than the width of said second surface； a plurality of heat conduits between the sidewalls of the heat insulating chambers, said heat conduits having an open and a closed position； wherein each heat insulating chamber is hingeably connected to at least one adjacent heat insulating chamber, such that the heat conduits may open and close as adjacent heat insulating chambers flex towards or away from each other.
