The Mountain Equipment Women's Helium 250 is a very warm, yet light down sleeping bag that was specifically designed to meet the needs of women. Thanks to its extremely low weight and small pack size, the sleeping bag should fit in any rucksack. It’s particularly well suited for trekking or travelling in the summertime. Thanks to the snug Alpine fit, the sleeping bag is extremely thermally efficient and lightweight. Plus, it's very comfortable to sleep in. For added warmth, not only does the bag have a comfortable 4-baffle foot box, but it also features an integrated collar with an easy-to-open Lode Lock closure that efficiently retains warmth. As for the material, the Helium is filled with high-quality pure duck down and has an extremely lightweight, tear-resistant and compressible outer shell that is downproof, breathable and windproof to boot! Of course, the Mountain Equipment Women’s Helium 250 down sleeping bag comes with a waterproof stuff sack to keep it dry as well as a cube for storing the bag between trips.