Specs are lacking on your page for this bag. Pulled theses off the REI page (from when they used to carry this bag) Page also has some reviews
http://www.rei.com/product/811092/big-agnes-summit-park-sleeping-bag
Temperature rating (F) 15 degrees Fahrenheit
Temperature rating © -9 degrees Celsius
Weight 3 lbs. 10 oz.
Shell Ripstop nylon
Zipper location Left
Insulation type Down
Fill 600-fill goose down
Fill weight 1 lb. 8 oz.
Lining Nylon
Sleeping bag shape Rectangular
Fits up to (in.) 78 inches
Shoulder girth (in.) 80.5 inches
Hip girth (in.) 74.5 inches
Stuff sack size 9 x 20 inches
Gender Unisex