Helium 15 Sleeping Bag - LongRemarkably light and compact, the Helium delivers impressive insulation. Use it as a three plus season bag to substantially reduce your load while backpacking and mountaineering. Features Fold Down Second Zipper Provides added Ventilation and Easy Access, Main Zipper Anti Snag Slider reduces Snagging Anatomically Designed Footbox with Wrap Around Construction increases Warmth Smooth Curved Baffles Reduce Down Shifting. Nautilus Multi Baffle Hood