For warm weather overnights, check out the award-winning Sierra Designs Zissou 30 Sleeping Bag. Stuffed with 600-fill DriDown insulation, this bag gives you the light weight, compressibility, and warmth of down in a bag that will stay drier, loft higher, and dry faster in both humid or dry conditions. Simply put, DriDown represents the evolution of down insulation. Regular down is treated with a molecular level polymer to create a hydrophobic finish on each individual down plume. This finish allows DriDown to stay dry longer, loft better, and dry faster than regular down, keeping you warmer in any environment.