Sonder -10°CThe Sonder sleeping bag is a streamlined, practical bag with versatile features, a spacious cut and a lighter build, designed for comfort and warmth year round. Featuring Storm foot technology: water and wind proof, breathable fabric on the footbox. Offered in three temperatures, rated to the lower limit of comfort for both males (M) and females (F): 5 M (+1 F) C or 8 M ( 2 F) C or 10 M ( 4 F) C tested in accordance with ISO 23537 1. The Sonder is