Even though sleeping like a tombed King Tut is super comfortable, it's much nicer to wiggle about while you sleep With the Sierra Designs Women's Backcountry Bed SYN Sleeping Bag, you can do just that. This synthetic option from the Backcountry Bed line has a EN comfort rating of 29 degrees Fahrenheit, making the bag suitable for late spring, summer, and fall camping or backpacking trips. If you're the type of camper that feels claustrophobic in a mummy bag, this bed might just be the ticket for you. A zipperless design not only saves weight but makes getting in and out of the bag quick and easy. The spacious design allows you to sleep comfortably on your back, side, or belly, while the integrated comforter wraps to your preferred sleeping position just like a blanket. Insulated handarm pockets give your limbs a cozy place to say when the temps plummet, and a hands free foot vent lets your feet pop out of the bottom of the bag. The bag also features a sleeping pad sleeve, which keeps the bag securely attached to your pad for a comfortably secure night's sleep.