Quilt 250 is now a 2-season product for use in spring and summer conditions. In terms of insulation performance it is comparable to the Lite Line 300 sleeping bag but lighter by nearly 200 grams! Quilt 250 is filled with 250 grams of goose down for the best 850 cuin fill power. It has a structure similar to the X-Lite 200 sleeping bag, except that we have removed the back part of the bag so that only a mattress is needed to insulate the user from the ground. This allows almost all of the down used in the quilt to expand and be used for effective insulation. Thus, in contrast to all sleeping bags, only a very small part of the down is compressed under the user's body and does not contribute to the insulation. ‘Wings’ of the quilt are automatically drawn underneath the sleeping person with an adjustable, elasticized system, so you can change position during sleep, without the hassle of the quilt shifting and loss of optimal insulation.