Seen this yet? http://www.ula-equipment.com/sleeping-bag.asp

Features
Sharks Tail shaped footbox
5 baffle footbox – 2 horizontal, 3 vertical
Stretch baffles, below the shoulders
3D Interlocking Draft Tubes
¾ length zip with guard
Anatomical Hood
Super Soft and lightweight liner.
Lightweight breathable fabrics
Neck collar to minimize heat loss
Ships with large mesh storage sack
Specs.
20 Degree
550 Down Sleeping Bag
2.59 lbs
84.5" x 31.5" x 21.7"
At $225 it seems like a weird combination of materials and features. Who uses 550 down in a sleeping bag? The specs are kinda sparse, what fabrics are being used? Kinda heavy.

