Vango has combined the very best in down and synthetic insulation technologies for this 4 season vango fuse 12 sleeping bag making it an excellent lofting yet compact sleeping bag for all year round use the unique blend of 70 hydrophobic down and 30 4t insulation offers the very best in insulative properties of a down bag in a compact package resistant to wet conditions the hydrophobic down uses premium 9010 duck down that has been humanely collected that has a hydro barrier to keep drier four