Down comforters can be heavenly in the summer months or when backpacking in warmer climates. They are about the lightest style of bag around, highly compressible/packable and offer great freedom of movement. They offer incredible versatility as well, I've taken one on an overnight trip into the Haleakala Crater with my 4 year old daughter. I've also used them as a comforter on longer haul flights. If you haven't tried using one in the backcountry, you may want to consider it.
Now for the technical stuff:
Outer side Fabric: iFlEX 5500 20D Ultralight Nylon Inner side Fabric: iFlEX 5100 20D Ultralight Nylon
Filling Fabric:90% White Duck Down Weight:
SP1: Comfort:+17° C/63° F - Lower Limit:+12° C/54° F
SP2: Comfort:+13° C/55° F - Lower Limit:+8° C/46° F SP3: Comfort:+6° C/43° F - Lower Limit:+1° C/34° F
Fill Power: 600 FP Zipper:YKK 5#
Filling: Duck Down Length: Length (1.8 m-2 m Height) Size: 200CM*80CM Model Number: SP1 SP2 SP3 Category: Down Sleeping Bag Comfortable Temperature Scale: [15℃~5℃] Type: 3 Season Brand Name: AEGISMAX Fabric: iFlEX 5600 20D Nylon