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In page Wool:

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Wool's thermal resistance supports its use in clothing for both cold and hot climates. Bedouin and Tuareg clothing includes wool for insulation from daytime heat and cold nights.[citation needed] Semigrease wool can also be spun into water-resistant mittens and sweaters, including garments associated with the Aran Islands.[citation needed] A small study of woollen underwear reported fewer heat and sweat rashes, which the researchers associated with moisture absorption.[3]