The Conundrum 0 850 sits in Enlightened Equipment's hybrid quilt/bag line, built with a sewn-closed footbox and a 3/4-length side zipper so it can be sealed up like a bag rather than left open as a flat quilt. It uses 850 fill-power grey duck down — RDS certified — totalling 663 g of fill within a 933 g overall weight, rated to 0°F (-18°C) for cold but not extreme conditions, one step milder than EE's -10°F Conundrum variants.
Continuous vertical baffles keep the down evenly distributed rather than shifting into cold spots, while a draft collar and draft tube seal the zipper line and shoulder opening — the areas most prone to heat loss on any quilt with a zip. This is the price EE pays for bag-like coverage: fully closed quilts need more sealing than an open top quilt.
As with other Conundrum listings, this one is cut in the Regular size, rated to a 183 cm maximum user height, so fit should be checked before buying. A stuff sack and storage sack are included, and the shell carries a DWR finish.