What kind of foam is used for sculpting?

There are these purses on Etsy that look like realistic food and they're really cool, but really expensive. I would like to make one myself with my own designs, but can't figure out what material is used. The seller just says they're made of "hard foam," but I was wondering if anyone would be... show more There are these purses on Etsy that look like realistic food and they're really cool, but really expensive. I would like to make one myself with my own designs, but can't figure out what material is used. The seller just says they're made of "hard foam," but I was wondering if anyone would be able to point me in the right direction to find the best kind? Thanks :)
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