THE WALKER’S lightweight mid layer is arguably one of the most versatile items of clothing because it can be worn year-round. When temperatures drop, a mid layer top or jacket adds warmth in a layering system, sandwiched between a base layer and an insulated jacket or a waterproof shell.
In warmer weather, when you still need to keep out the chill of a breeze or cold morning air, a mid layer also serves as a useful outer layer.
The aim is to provide a balance between warmth, breathability and moisture evaporation, depending on the weather and what activity you will be doing.
There are many products labelled as mid layers, from the traditional and simple fleece to more technical soft shell-style jackets, with windproof and drizzle-resistant exteriors and soft fleecy insides.
Most mid layers are designed to be stretchy and neat-fitting, which is a useful way to trap heat created by the body. Longer arms and a dropped hem at the rear can also help keep warmth in. Some mid layers have thumb-loops for a closer fit and as a way to protect the wrists from the cold. A hood can be for extra for warmth around the neck, ears and head when needed, but also create extra bulk under a shell.
When your body temperature rises, heat can be controlled by opening zips – from quarter length to full length – or rolling up sleeves. Some mid layers are designed with ‘zoned’ areas of fabric that allow for more air circulation, particularly as under the arms and at the back. Most modern mid layers are good at allowing sweat to evaporate because the fabric is fairly thin and permeable.
With so many brands and models to choose from, our gear testers Peter and Fiona give their thoughts on a selection of the
