Down filling has the greatest warmth-to-weight ratio of any insulation, but it has a fatal flaw: It fails when wet, making many active folks turn to winter jackets and sleeping bags with synthetic insulation. By utilizing a new waterproof-treated down insulation, the Sierra Designs Zissou 15 (rated to 15 degrees F) solves this issue. It's also one of the best sleeping bags in recent years. We spent significant months testing it in such areas as the always-wet Olympic National Park rainforests, and the trim, yet comfortable bag never failed to keep us dry and warm. [$260; sierradesigns.com]
Gear of the Year
The best tools, tech, and toys of 2013.
Plus: Lance Armstrong's Downfall
ON NEWSSTANDS NOW
Sign up to receive the Men’s Journal newsletter and special offers from MJ and its marketing partners.