It is the Zippered Vents Sleeping Bag.
As you can see from the photos, the idea is that the sleeping bag only covers the part of your body that needs warmth, and you unzip where you are too hot.
Four zippers going across the width of the sleeping bag give you that choice. With a built in pillow and flannel lining, the makers also suggest that you could use this around the house to keep warm. eg. watching TV.
Personally, if I ever get too hot sleeping, I would either remove one of the multi layers I am wearing, or open up my ONE zip on my sleeping bag to let some warmth out. It's not that tricky.
At US$119 this might appeal to those of you who sleep warm. Available here at Hammacher Schlemmer
So, anyone going to be buying this soon? Leave us your comments!