Existing modelPlease note that the girth circumference is not a flat number, as this sleeping bag is a sleep system that goes on top of the mattress. So the width is 52 inches, and if you were to add in the 20" mattress you'd get a circumference of 72".
Please also note in "features" that there is an insulated draft tube, but no zipper. We checked the box anyway.
Continuing the push for at-home-like comfort of sleep systems rather than sleeping bags, the Alpine Down Blanket offers 3-season warmth at a light weight. Ideal for fast and light summer excursions into the backcountry.