The construction of a sleeping bag defines how the filling is kept in place and layered inside the bag. It indicates how well the filling insulates and ultimately determines where and for what you can use the bag.
The most simple design for a sleeping bag is to use the stitched through construction. Using this method the shell and lining are stitched together directly on top of each other to create the chambers into which the filling is inserted.
The H-box, H-chamber and Box Wall Construction is divided into different chambers with vertical side walls to keep the insulation in place and to avoid cold bridges. This ensures a uniform thickness of insulation all through the sleeping bag.
A slanted wall construction creates a more difficult path for heat to escape along the relatively low-density insulation area against the side wall. This improves the thermal efficiency of the bag even more than box wall construction.
The H+S Box construction combines the best from the H-Box and S-Box chamber construction for the greatest possible insulation, ensuring that the down will stay in place in every situation and eliminating every possible risk of cold bridges.