BEST FOR: Light-and-fast missions.
THE TEST: Camped out under a tarp, one tester appreciated the highly windproof nature of the redesigned UltraLamina. To help prevent cold spots, its proprietary synthetic insulation is welded (not stitched) directly to the shell and lining. The design also increases loft, and our tester slept soundly even as a heat-sucking breeze blew through his crude shelter. The two-pound bag packs as small as a Nerf football in its compression sack (included), and a snug cut reduces bulk and boosts warmth, though some found the shape constricting.
THE VERDICT: The bag to get when warmth-to-weight trumps a generous cut. 32˚; 1.6 lbs.
WARMTH-TO-WEIGHT RATIO: 4