IH-666R-14 - Indigo 14oz Sanforised but Unwashed Selvedge Denim Slim Cut Jeans
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Is there any need to presoak this denim?
I wouldn't think so, since they've been sanforized. I think the recommendation is to soak the UHR (ultra heavy raw).
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Since it’s unwashed, you will get some shrinkage the first time you wash them, just not as much as you would get with raw denim. A soak won’t do much of anything shrink-wise IMHO, but it will help to get rid of the creases from where they were folded. I always at least soak everything for this reason.