All you need in one product! A 3 in 1 jacket is a great, simple option for people who just want an all-round jacket to get them outdoors. 3 in 1 jackets have a detachable inner jacket, usually a Thermoball baffled insulated jacket or a zipped fleece jacket which gives warmth to the core. A waterproof shell jacket goes over the top and on it's own is packable and lightweight, great for casual wear in showers. Combine the two together with an integrated zip and you have a complete weather solution which is comfortable, well-fitting and warm all year round.