Thermodown 15 Down Quilt vs Katabatic Gear Alsek Quilt

The Thermodown 15 is the warmer-rated, more versatile quilt: a 15F rating, a closable mummy-style footbox and a full draft collar setup make it the better pick for cold nights and for anyone who wants one quilt to cover three seasons. The Katabatic Alsek is the lighter-duty, higher-grade build: 850 fill-power down, Bluesign fabrics and a patented pad attachment system that owners say kills drafts, but its 22F rating suits shoulder seasons better than deep cold. Reviewers of both call them warm for their ratings and packable; the Thermodown's main complaint is a narrow 56-inch width, while the Alsek costs more for less temperature range.

• Choose the Thermodown 15 if you sleep cold, camp in shoulder seasons or winter, or want a quilt that closes into a mummy bag and opens into a blanket.
• Choose the Katabatic Alsek if you want the lightest, best-drafted quilt for three-season trips and trust a proven pad attachment system over a lower temperature rating.