3-season sleeping bag, will keep you comfortable in temperatures down to 40 degrees. Can be used down to 35 degrees, but individual warmth varies from person to person. Sleeping bag expectations: They are not to be used outside of the tent (or whatever lodging you are using), be careful not to spill or get any liquid on bags because they are difficult to dry, use the provided liner inside all sleeping bags, if zippers become stuck do not pull harder. Before returning, shake off dirt and ensure the inside is empty. Take liner out of the bag. Air dry if wet.