This Versalite is the warmest in the Extremelite series. This bag is an ideal 3 season bag for mountain adventure, or for those that just run cold. The Versalite sports 565 g of high lofting 850+ goose down for 17 cm of loft and a temperature rating of -12C. A full collar will seal in the warmth and protect you from the cold. 157 cm of shoulder girth is roomy and the total weight is only 905 g.