The Mountain Equipment Xero is an exceptionally versatile and well-designed 3-season sleeping bag. It is insulated with ethically sourced Hungarian goose down, blended to ensure optimal quality. Thus bag features Mountain Equipment’s EXL technology; this top lining improves loft and thermal efficiency. The narrow box wall baffles of the Xero help keep down in place and eliminate cold spots. The fabrics of this bag are exclusive to the brand are notably lightweight and breathable and the lining of this bag is Mountain Equipment’s lightest and softest next-to-skin layer. To keep in warmth and eliminate drafts, the Xero is equipped with an anatomical hood and 3-dimensional neck collar. The bull’s-eye, 5-baffle toe piece and shark’s toe box maximize loft and allow the feet to rest in a more natural position than traditional toe boxes. The Xero from Mountain Equipment is a great fast and light 3-season sleeping bag for those who want lighter weight without losing comfort.