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Gear School: Insulation

Stay toasty with the right fill for your bag and puffy jacket.

The Ratings Game
Two 20°F bags from different brands may not be equally warm.

Solution: A new standardized system from Europe, called EN13537, that makes ratings consistent. The standard relies on independent labs that test bags using a heated copper mannequin and 20 thermal sensors. REI and Marmot currently use this system, with more companies expected to follow.

Behind the Scenes
Read our in-depth report on EN13537–and learn to decode the ratings–at

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