Anyone travelling in the mountains is always exposed to the vagaries of the weather. It might rain heavily, hail, snow or blow a cold breeze, or the sun might burn down mercilessly. Just as varied as the weather may be, so are the demands on modern functional clothing. SALEWA has over 70 years of experience in mountain sport, and together with some of the best Alpinists and outdoor sports experts, it has developed the most functional of all clothing. All the various SALEWA textile collections have one thing in common, that in material selection, in their preparation and in the detailed technical solutions provided there can be no compromise. In practice this means: perfect weather protection, uncompromising robustness and maximum comfort. The multi-layer principle in clothing The comfort of clothing also depends on whether the temperature is correct. Since, however, the outside temperature is constantly changing and depending on their level of activity people generate more or less warmth, there can be no perfect piece of clothing that always offers the right temperature. For that reason the so-called multi-layer principle (known to some as the “onion principle”), namely the wearing of several layers of clothing, is still the best suited to comfort. This principle means: preferably many thin layers rather than a few thick layers. As a basic model, which must of course be adapted to the relevant touring conditions, the following sequence of layers can be recommended: Layer 1: underclothes, shirts and pants made of micro-fibres such as polyamide and polyester, or natural fibres such as wool, long or short or one on top of the other. Layer 2: - light fleece clothing such as Zippulli, jacket e.g. Polarlite® micro or thermal or shirt e.g. Polarlite® fine or Polartec® Classic 100 - warm fleece clothing such as jacket, pullover e.g. Polarlite® classic or Polartec® Classic 300 Layer 3: durable wind-resistant functional clothing e.g. SALEWA Softshells of Stormwall®, Polartec® Powershield® or Polartec® Wind Pro®. In dry weather these replace layer 4. Layer 4: durable watertight and windproof functional clothing e.g. GORE-TEX® or Powertex® According to the prevailing outside conditions, individual layers can of course be worn singly. Down jackets are outstanding in dry cold as warmth insulation, but if you move about a great deal they are often too warm. They are rather suited to pauses or for camping, for instance for keeping warm at night in addition to the sleeping bag.