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Cotton wool -- absorbent cotton -- absorbs water, and would not shrink.
A wool blend coat has been designed not to shrink, based on the blend of the wool. However, you could wash the wool coat in hot water with maximum agitation, which affects the wool, but not the blend. Your results would be unpredictable.
Wool socks, like all wool clothing will shrink when washed. However due to the blended wool it is unlikely that wool socks will shrink much.
wool from sheep. silk from silkworms.
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Wool is fabric that is made from sheep wool. Its spun and turned into fabric. Silk is made from the cocoons of silk worms. Wool is typically thicker, and silk has more flow.
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Warm and hot water is known for shrinking clothes at times, especially wool or cotton clothing. Cold water will not shrink clothing.
"Hurt" here requires a context.When you wear your wool jumper in the rain, you can dry the jumper and have no trace of 'hurt'.If you agitate your wool jumper in hot water, it will shrink.
Silk, rayon and wool are all fibres.
Silk is smoother than wool.
If you wet it with hot water like washing it it could shrink.