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Down Fill


Temperature Range

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The North FaceMountain HardwearBlack DiamondOspreyMarmot

How to Choose a Down Sleeping Bag

Get the Low-down

Down bags use duck or goose down, which consists of the small, fluffy feathers birds grow next to their skin for insulation. Ounce-for-ounce, no man-made fiber can match the warmth-to-weight ratio of this remarkable material. Highly compressible and extremely lightweight, down is the preferred choice for traveling small and light. The bags on display a temperature rating in the title. This is the EN, or European Norm, rating which is a standard used throughout the industry. This number is used to give you an idea of the lowest temperature at which the bag will keep you warm.


Down bags have a fill rating that indicates the amount of volume one ounce of down occupies. The higher the fill-rating, the loftier the down. It provides more warmth with less weight.


Mummy-shaped bags taper towards your feet to reduce volume and hold warmth closer to your body. These bags can feel restrictive to some. A semi-rectangular bag can offer more room to move.

Moisture Management:

Down insulates less when wet. Some bags feature hydrophobic treatments on the outer fabric or on the down itself (like DriDown) to keep the down insulation dry.