In cold weather, socks made from a blend of natural and synthetic materials work best, such as merino wool and polyamide, say. With a higher proportion of wool, you get good insulation and odour control, while the synthetic fibres are effective at moisture wicking and shape retention. Thicker, more heavyweight socks are usually warmer and more cushioning too, but ensure that they don’t make the fit of your boots too tight. When it comes to length, you could look at knee-high or calf-length socks for greater coverage.