This envelope-style sleeping bag is light-weight and can keep you warm at your camp site after a day of hiking and climbing. Our bag is a 3 Season bag that It’s great for use in cabins and camping tents outdoor in temperate conditions as low as 40 degrees F. It’s made of 190T Nylon, waterproof, 2 x 250G M2 hollow cored fiber and has a side zipper for easy entrance. Our sleeping bag also compresses and can be easily attached to a backpack. It comes with a compression bag that can be tightened by a drawstring for easy portability. Our bags come with a full 1 year warranty. If your bag rips, tears, or just gets too dirty, send it back to us for a free replacement.