As far as I can see, they list 800FP down in all of their sleeping gear.
1-Season Quilt:
800 Fill Power Goose Down Insulation
20 Denier Nylon Ripstop Shell
20 Denier Nylon Waterproof-Breathable Head and Foot Arid Zones
30 Denier Polyester Ripstop Lining
What weirds me out is that the 3-season TQ seems to have disappeared from their site. I hope they haven't stopped making it, it's a great piece of gear.
Edit: Looks like GL is releasing a new line of quilts in early 2013 and are busy getting those ready instead. It'll be interesting to see where they go with the designs - they've been changing their materials around lately, compare the above materials list to my 2011 model:
800+ Fill Power Goose Down Insulation
15 Denier Nylon Shell
100% Tier 1 Recycled 22 Denier Polyester Lining Fabric
Microgrid Ripstop Shell
Ripstop Lining
Waterproof-Breathable Pertex® Shield Eco Shoulder and Foot Protection
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