Innovative PolarLite insulation keeps you warm even though entire bag is thin and light. 3-piece no gap hood pulls in perfectly around your face. Bag shapes to body lines and has a vaulted foot-box with an extra layer of fill to keep feet toasty, even in freezing weather. Zippers inside and outside of bag for easy closure. 87″ x 34″ (at widest point) provides more shoulder and leg room. Weighs 4.1 lbs.