"A very luxurious sleeping bag with a warm and cool side. A 'warm lace' made of extra soft brushed polyester. A 'cool lace' with very luxurious satin cotton. So the sleeping bag can be used both straight and inside out. In addition, the sleeping bag is provided with extra insulation through 2 layers of a total of 400g/m² high quality microfiber siliconized filling. Comfortable from approx -2 degrees, usable from approx -8 degrees. This sleeping bag can be zipped onto a second Gramark sleeping bag to create a larger sleeping bag. It can also be attached to Vendeen and Altay sleeping bags."