Mid-layer
The coldest days will demand the additional insulation of a mid-layer: one between your base layer and the outer layer that is your final defence against the outside world. A stretchable, Roubaix-lined jersey, such as Endura’s FS-260-Pro Roubaix Jacket, or the recently tested dhb Vaeaon Zero jersey both have the fleece-lining that proves such an effective insulator.
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Your choice of external layer will have much to do with your own personal thermostat, and prevailing conditions. If it’s windy, but not too cold, say nudging double digits, a ‘hardshell’ outer like a gilet maybe all that’s required to provide an extra defence against the wind or light rain. If, however, conditions are very cold, say, zero and below, but dry, a softshell jacket – heavier, but more insulating than a jersey – might be required. The RH+ Iceland Jacket is one to have fallen beneath the RCUK microscope this winter. Wet weather will demand an outer layer with different fabrics. Which brings us to…