The terra nova elite 350 down sleeping bag is a super lightweight and compact sleeping bag with 8020 duck down fill ideal for spring and summer backpacking trips where weight and pack size needs to be kept to a minimum this sleeping bag has a box wall construction to eliminate cold spots locking zip sliders to avoid the zips creeping open and a 3d hood with drawcord closure to keep the warmth in it also has an internal pocket and a compression stuff sack so you can reduce the size when you are