Feathered Friends Eider ES Sleeping Bag

Yes, it is specifically engineered for high-altitude mountaineering and demanding winter expeditions. With a temperature rating of -10 degrees Fahrenheit and 900+ fill power goose down, it is built to handle sub-zero environments.

The Eider ES features a wide mummy design, which provides more interior space than a traditional, narrow mummy bag. This extra room allows you to wear additional layers or keep essential gear inside without sacrificing thermal efficiency.

Continuous baffles allow you to manually shift the down insulation around the bag. This means you can redistribute the fill to the top or bottom depending on your sleeping position or the specific temperature needs of the night.

The bag uses a waterproof-breathable shell paired with an electrospun panel designed for moisture management. Combined with tuck-stitch construction to prevent moisture wicking, it is highly effective at keeping the down dry during long, cold nights.

This bag is designed to fit users up to 78 inches tall. If you are near this height, the 3D contoured hood and draft collar are designed to seal in heat effectively without feeling cramped.

Yes, the bag includes a generous draft tube that runs along the zipper. This acts as a critical barrier to prevent cold air from entering and warm air from escaping through the zipper seam.