The 2008 Marmot Never Summer sleeping bag looks like it will always keep you snug and warm even on the coldest winter days. Campist blogs that is has a number of features to help keep you comfy in temperatures as cold as zero degrees fahrenheit.
It's rated as a three-season sleeping bag, but the 2008 Marmot Never Summer sleeping bag can easily take you through all four, thanks to features like the heat pocket and baffle hood, which keep you toasty when temperatures plummet as low as 0ºF. The Never Summer sleeping bag comes with a 600+ fill goose down, packed in a durable and waterproof nylon shell. Ground-level side seams eliminate drafts, and locking zippers keep the sleeping bag closed throughout the night. If that's not enough to keep you warm, a pocket in the footbox to stash a heating pad definitely will! From head to toe, you're covered.
The sleeping bag has a retail price of $269. More expensive than a regular sleeping bag but if you are out camping on a cold night you will appreciate having it with you. More details here from the TravelGearBlog who gave the cozy sleeper a nine out of ten.