Even when you're expecting mild temperatures, any trip to the mountains requires that you be prepared for variable weather. The versatile Rab 10 Degree Down Neutrino 600 Sleeping Bag will keep you comfortable on cool summer nights and prepared for chillier conditions in the spring and fall. Its 800-fill down provides toasty warmth, even when the temperature dips into the twenties and teens, and will retain its insulating power in wet environments. Filled with hydrophobic down, made with a water-resistant Pertex Quantum fabric, and stuffed into a dry-bag compression sack, the Neutrino 600 ensures that no matter what the weather is on the hike in, your sleeping bag will always be a cozy refuge when you roll into camp. Plus, it's got a unique trapezoidal baffle design that helps eliminate cold spots and prevent down migration, so you won't wake up in the middle of the night with a case of the shivers.