Rating: 5 / 5
10oz (for my size M). Lofty. Top-quality down. The Flight jacket perfectly balances minimalism and comfort, while still having nice features like a draft tube behind the zipper, down-filled pockets and an easy-to-manipulate drawcord hem.
As reviewed here and elsewhere, the Flight jacket nears the gold standard for down insulating garments. It is far too warm for engaging in aerobic activity, but for in-camp chores, lounging, and sleeping, it's a feather-weight, feather-filled do-all that has measurably improved my experience in the outdoors. I'd go so far as to say it feels about twice as warm as a Primaloft jacket that weighs twice as much...but that's an entirely subjective measure.
Its lightweight insulation capabilities have allowed me to travel lighter by carrying fewer clothing items. A synthetic or wool shortsleeve base layer, a sub-three-ounce windshirt, and the Flight jacket (in conjunction, of course, with proper headware, gloves, and leg coverings) keep me toasty, when tired and unfed, at all temperatures above 20° F.
Despite the 5/"Best" rating, there are some inherent limitations to a garment like this. It's not a good insulator against conductive heat loss, so use a pad when leaning up against those cold rocks in the morning. The neck isn't as high as you might find in other jackets made by companies like Feathered Friends and Nunatak (solved by a fleece-lined balaclava or neck gaiter). There's the Michelin Man effect. The shell material is nicely water-resistant for small splashes, and is quite susceptible to laceration.
But I'm the puffiest ball of warmth in camp. This piece is a true classic, and for good reason.