Cumulus Ultralight Bivi

Truly lightweight. It weighs halfthe weight of many covers in the same category (windproof-water resistant), from BD, ME, Rab, MSR,(siliconized finish, Drylite, and various inductions or membranes). etc., with the same good or bad performance. The condensation problems are the same as any other. Directly proportional to the relative humidity, period. Two typical examples: On a windy, cold night with low to medium humidity, the result is very satisfactory. On a calm night with medium to high humidity, you'll wake up with the outside of the cover, and the outside of the sleeping bag, wet. In any case, it's the best cover I've ever had, as it's very well made, performs as well as any other, and weighs half as much. Very happy.