For campers who are looking for products of down sleeping bag which is able to provide maximum warmth, you can search it on Kelty. You will find a lot of sleeping bags there like what you are looking for. There is one product called Cosmic 20 from Kelty which is included as hotter sleeping bag. It has been upgraded for higher performance which can support with exceptional warmth while sleeping outdoors. You can use this sleeping bag in three seasons. This item also comes with other excellent features such as top draft collar and thermal comfort hood. The zipper is also made with antisnag design.