From summer traverses of jagged mountain ranges to shoulder season treks through the desert, the Therm a Rest Women's Mira HD Sleeping Bag provides exceptional warmth and comfort, so you'll be refreshed and ready for another full day on the trail. Now insulated with 750 fill, hydrophobic goose down, this 27 degree, three season bag will perform well in wet and dry climates alike.With a women specific cut, the Mira HD moves volume from the shoulders to the hips for an un restrictive feel that maintains exceptional warmth. Zoned insulation places more down at the top of the bag where heat tends to escape, while the Synergylink mattress connectors ensure the bag stays attached to your mattress, letting the mattress do much of the insulation work. A Toeasis foot warmer gives your toes a cozy home, and a full length draft collar and tube prevent warm air from escaping through the zipper and at the top of the bag. Therm a Rest's own Thermacapture lining reflects heat back at your body of even more warmth so you'll sleep great whether you're perched in a mountain cirque or nestled in a desert canyon somewhere in the Southwest.