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Sanforizing is a process where the fabric is run through a sanforizer; a machine that has drums filled with hot steam. Sanforizing denim is a method of stretching and manipulating the cloth in the factory prior to any washing so that any shrinking during future washes will be minimalized. It is important to note if your raw jeans are sanforized or not, because before determining what size to buy, you must know non-sanforized jeans will shrink 7-10%, while sanforized jeans will shrink 1-5%. It is often advised to give non-sanforized jeans a warm soak before wearing them to get the shrinking done before you create wear marks on the jeans.

Photo of sanforizer machine:

Source: Organic Cotton Plus/Style Forum

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