It is built from 20D Atmos fabric, which uses tightly woven yarns and a DWR coating for improved water-resistance and exceptional softness. Reliable overnight warmth is provided by Stratus polyester sheet insulation, which is overlapped in a shingle pattern on the upper part of the bag to help reduce cold spots. The highly efficient mummy design features an angled foot box for a more relaxed posture after a tough day on the trail and a sleep limit of -1°C makes it highly practical for a wide range of outdoor applications. In addition to a zipped internal stash pocket for valuables and an insulated neck collar to trap the warmth, it features a three-quarter-length zip with insulated baffle for the ideal balance between weight, access and ventilation.
Stratus™ is a high-performance, synthetic insulation developed by Rab. This soft polyester insulation is designed to trap the maximum amount of air possible and offers superior warmth for its weight. Stratus™ retains warmth when wet and dries quickly, offering fantastic insulation in wet and cold conditions.