Softshell Jackets are designed for use outdoors as part of the layering system, and can be used alone, ideal for aerobic activity in light weather conditions if they are water repellent and highly breathable, or as an insulating layer under a 'hard shell' outer jacket.  “Softshell” is a class of knit or woven materials, made from polyester and nylon, used to make technical outdoor clothing that essentially bridges the gap between waterproof hardshell jackets and highly breathable fleece jackets. They’re more breathable (but less water and wind resistant), more flexible, and generally more durable than hardshell materials, and more protective than fleece. Softshells emerged in the early to mid-2000s and are now preferred over the more traditional fleece and raincoat options