 Get your layering system right and you'll stay warm, dry and comfortable, whatever the weather throws at you when you head outdoors. A layering system contains three types of clothing. A base layer, a mid layer and an outer layer. The system has three main functions. To wick sweat away from your skin, trap body heat and protect you from the elements. The base layer worn next to your skin excels at wicking moisture and is crucial for temperature regulation. It is usually made from polyester or merino wool due to their quick wicking and fast drying properties. Avoid cotton as it retains moisture which can make you feel clammy and cold. The mid layer is the item you wear between your base and outer layers. It traps heat to help keep you warm but also allows sweat to escape so you don't get damp. Micro fleece is practical for high out pack activities while heavier fleece layers suit cooler temperatures. Down insulators are superb in cold, dry conditions while synthetic insulators will continue to work even if they get wet. The outer layer or shell is your defence against the elements be that wind, rain or snow. The fabric is durable but also breathable, allowing moisture to wick away from the skin and escape. For wet weather protection, not for jackets made from a waterproof breathable membrane like Gore-Tex. Each part of the layering system serves a different purpose, working with other layers to keep you warm and dry. This versatile method lets you add or remove layers for comfort in any weather, crucial for great outdoor adventures.