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I am curious for any of you who get shoes, especially the slip ons that are too tight, do you swap out the insoles for anything else to see if you can stretch them out a bit more with thinner or old insoles? I know it often defeats the purpose of getting new shoes with their own pro insole, but this is the same problem a few people I know have too, one of whom has tried this with some success - put in thinner or old insoles first, wear the shoes in, then add in the new insoles that came with the shoes when they stretch out or start to become soft and feel a little loose, at which time they feel half new, or at the very least a bit more solid.
That said, some other shoes I have just don't fit, no matter what I try, or I have the thinnest insoles in them so only wear them as chillers, which is silly as I got them to skate in.
There is the other option of stuffing them with something like newspaper and trying the boiled water trick, then when they cool enough to wear, put them on with a couple of pairs of socks and do something active in them, so they stretch out a bit more.
Someone might say the microwave trick too, given they are slip ons, no metal eyelets, but trying shoe stretchers is also an option that I have used for other shoes in the past, which has worked.