The under quilt is built similarly to the top quilt but has a lot more down - 2" mesh baffle overstuffed to 2.75". Both quilts were modeled after JRB's regular non-slit quilts and thus hang the same. This under quilt is equivalent to something in between the Mt. Rogers and Katahdin large quilts from JRB except mine is lighter and has 900 down instead of 800.
Edit: I'd keep it all if I didn't need the money.