Style Winter Rules No 5

The Bobble

According to research from Canada - the home of snow - wearing a hat in the cold not only locks in body heat, it also maintains blood pressure (which rises in the cold) and encourages your body to readjust quickly when back in the warm. In other words, wear a hat. Grey and pink Alpaca Fluro bobble hat, £135, by Richard James. White cotton shirt, £105, by Nicole Farhi. Purple cable cashmere jumper, £385, by Polo Ralph Lauren

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Photograph by Lisa Gee