Our shell jacket. Here at Isbjörn we call it a 3-layer hard shell jacket. This garment offers more robust protection and is designed for more extreme weather and activities. It keeps out the wind and rain and the outer fabric is lined with a membrane that allows excess heat to escape. It has taped seams throughout. Our Expedition hard shell jacket is made of an exceptionally strong nylon fabric called Nylon Taslan, which has far greater durability than normal polyester. The third and innermost layer not only helps protect the membrane, but also adds to the overall increased durability of the material. This hard shell jacket has all the features you might expect of the performance wear needed for skiing, sailing and other more physically demanding activities. For older children we definitely recommend this garment as an alternative to a padded ski jacket. Particularly if they have a tendency to get hot and sweaty while enjoying outdoor activities.