Why does washing some clothes in hot water make them shrink?
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The long organic molecule chains that make up cottons and other fabric textiles form long thin strands of cellulose fibers. These fibers are also hydrophilic which means they love to attract and hold onto water. When you get them wet in the washer, this lubricates between the fibers and so they’ll tend to pack together more densly. Heat also relaxes these molecules to the fibers will get more bendy for a while and they compact together more easily. Also the mechanical tumbling combined with the water and the heat also physically compresses the fibers a bit. Add all of it up and the fibers making up your clothes are just now physically more dense, the material literally got smaller.
Just hang your woolens and shrinkables up to air and drip dry.
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