Our Ultralight bag is a great warm weather bag, and works well in cooler weather if you wear insulated garments while sleeping. An extremely compact sleeping bag when compressed, this European-made bag is of exceptional quality and is perfect for "going in light." Not just a stand-alone bag, the Ultralight can be used as a liner for the Reveille, which when combined turns the pair into a good cold weather bag. If you buy both, you will be ready for any environment. The Ultralight features Carinthia G-Loft insulation, the best synthetic insulation on the planet. The incorporated mosquito net allows you to sleep under the stars in warmer weather, while keeping the summers bugs out. PRODUCT INFO Comfort rated to 41 F. Practical "push" rated to 10 F Sizes: Regular for body height up to 72.5" Long for body height up to 78.7" Weight: 2.4 lbs Eberlestock Ultralight Sleeping Bag Regular