The Ultralight Wool Cotton is designed with a lighter cotton casing and cool, breathable filling (150gsm) combine to offer the ideal sleep solution for Summer and warm climate weather. Wool and cotton together provide natural, healthy sleep while reducing overheating and perspiring. Because wool is a breathable fibre and cotton absorbs moisture, the combination regulates the body temperature throughout the night leaving you cool, relaxed and comfortable. Made using Airlight Technology^TM, the lightweight single layer design of wool and cotton combined with a superfine cotton casing will perfectly regulate your body temperature, ensuring a cool, dry and comfortable sleep in warm conditions.