This burly sleeping bag from Western Mountaineering is a three season option for those really cold trips. 

850 fill down.

Features:

• 5 1/4 Spacing/Continuous Baffles - allowing you to move the down around inside the bag to 
• 62/39 Shoulder/Foot Girth
• Full Down Collar
• 7 Loft, -15° C
• 26 oz. Down Fill
• 2 lbs. 7 oz. Total Weight