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Extra warm underwear
Underwear made from fibres such as Thermalactyl, Chlorofibre and polyester which have been treated in various ways, is extra warm and also wicks away moisture from the surface of the skin. It is known under various copyright names, and the best sources are likely to be shops selling outdoor equipment; there are also a number of mail order catalogues.
Chlorofibre or Thermalactyl needs to be washed with care and allowed to dry naturally as it tends to shrink when dried in a tumble drier.