Move over, baffles. The Seamless Down Hugger’s design enhances warmth while reducing weight: A web of polyester and nylon threads hold the 900-fill down in place, preventing clumping. A spiraled elastic stitching embedded in the bag conforms to the sleeper’s body—the shoulder girth can extend from 53 to 75 inches, and the knee girth from 44 to 61 inches—which eliminates dead space and allows the down (and air) to loft to its fullest potential. This kept a tester warm during a 17°F night in the Canadian Rockies: “I forgot to bring extra socks and wore damp pants to bed, but I stayed much warmer than I deserved,” he says. Caveat: It’s expensive.
The seams holding the bag’s 13-denier, PFC-free DWR-treated nylon together are fully taped. “I was unaware that I’d been sleeping in a small puddle, and didn’t notice any wetting out or a significant loss of loft,” our tester says. With a half-length zipper, packability scores high as well: The Seamless Down Hugger packs as small as a loaf of bread.

from Backpacker