Any lover of the great outdoors should have at least one fleece in their wardrobe. Why? Because a fleece always comes in handy for all activities in colder environments. A fleece keeps you warm, is easy to maintain and easy to store. On top of that, fleece is lighter than wool, and unlike cotton and down, it retains its insulating properties even when wet. There's no more reliable jumper or jacket around! During a trek spanning multiple days in particular, a fleece is a must-have. That's because even if your fleece jacket gets wet, you can count on the fact it will be completely dry and ready to go the next morning. If you ask us, a fleece is an essential element of the tried-and-tested three-layer system.