It doesn't matter it if you're hosting a house-guest, spending a weekend at a cabin, or camping at your favorite National Park, our weekender is the perfect multi-purpose sleeping bag! A polyester shell repels moisture, and a luxurious cotton flannel liner keeps you warm and cozy on the inside. A generous helping of 4 lbs of Poly-Therm hollow synthetic insulation will keep you warm in weather between 30-40°F and will not lose insulating efficiency if wet.