To create an even more comfortable system Montbell have utilized an elasticised thread in the stitch to create small "gathers" in the quilting. Through the combination of strategic seam orientation and the stretch provided by gathered quilting we offer unrivalled fit and comfort. These innovations allow the Montbell Down Hugger 650 sleeping bag to move with you as you change positions throughout the night, drawing the insulation closer to your body and eliminating drafty dead spaces. Keep body heat inside your sleeping bag, where it belongs.