Best Answer

Because the sweater is from a sheep's wool and it has many layers, to keep whoever wears it warm.

Another Answer

Dead air space (motionless air) is the best natural insulator. The sweater helps to trap air and keep it still above the surface of your body. This helps you retain body heat that would normally be broadcast off your skin into the cold, moving air.

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Q: How sweater give you warm in winter season?
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Related questions

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It really depends on what kind of winter you have ( Eg. California winter vs Canadian winter.) But usually it consists of boots, Jeans/pants, Longsleeve with a sweater ontop, and a warm winterjacket over it. Possibly with gloves/mittens, a hat, and/or, a scarf (:

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