Have you ever crawled into your sleeping bag and zipped it up tight to get warm, only to wake up later in the night drenched in sweat' Well, with the Sierra Designs Women's 30 Degree Down Backcountry Bed 800 Sleeping Bag, nights like that are a thing of the past. The comforter design and 33F rating mean this bag works well for shoulder season trips and high altitude summer camping. The new Backcountry Bed line utilizes what is essentially a sewn on comforter inside of a permanent U shaped opening on the front. As you get cold, you tuck it around yourself. As your body heats up, you can either untuck it or, if things are heating up, just push it outside of the bag entirely. The best part is that your body is used to doing this naturally, provided you sleep with a blanket of some sort at home. This means that you won't be waking up in the middle of the night in order to zip and unzip your sleeping bag. To round things out and add to the bedlike experience, Sierra Designs gave this bag an integrated sleeping pad sleeve so you won't slip off your pad during the night.