These Wenszel Grande Sleeping Bags are rated to 0 degrees.  With a Large number 7 self repairing zipper and quilt through construction the Wenzel Grande sleeping bags are great for extended stay cold weather camping. 
Wenzel 49239 Specifications:

Size: 38" x 81"
Fill: 6.5lbs. of non-allergenic Insul-Therm
Outer: 8 oz. cotton
Liner: Cotton flannel
Storage: Compression straps with dust cover
Temperature Rating: 0 degrees F
Shape/Size: Oversized