It's a bit hard to measure once the footbox has been sewn up but it is about identical to my Golite Ultra 20 and measures 52" when stretched. I would agree with the 54" shoulder and 44" hip width that is posted on the Katabatic website.
As a side sleeper that flip-flops back and forth between sides during the night, I have found that the width covers me. For reference I am 5' 9" 170lbs and my shoulder girth is 51" and my hip girth is 40". I had no draft or coverage problems and did not use the cords to strap the quilt down to the pad.

