The success of many outdoor activities depends crucially on the equipment used. At the activity planning stage the weight and packed size of the sleeping bag used must also be taken into account, two criteria that the Fever Zero managed to optimise to crucial effect. Weighing just 280 grams, this sleeping bag is extremely light and can be packed into a total size of just 11 x 18 cm, which equals the size of two oranges. This reduction is made possible due to a lightweight, tear-proof nylon fabric that weighs only 20 g/m2. The fabric is made from ultra fine 7 denier yarn, and is so special that it can only be weaved in one factory in Japan. In order to give the fabric additional stability, it features a specific rip-stop structure. Despite its low weight, the Fever Zero keeps its user stunningly warm, a property that is facilitated by the bag being filled with a special kind of goose down. Fever Zero features pure white Crystal Down: a special selection of the finest down from European geese in a 95/5 grade. The high quality of this down allows for a fill-power of 900+, which supports good warmth retention properties. Through a groundbreaking symbiosis of material and technology, the Fever Zero emerged as a sleeping bag that amazes with its innovative lightness – creating new possibilities for outdoor enthusiasts.