Is prayer on sponge mats valid?

Machine translationRead the Arabic original

The questioner : ...

The Shaykh : No, these are not mats on which a person can settle. The mats people use today are soft sponge. This is not something on which a person can settle... likewise. But if it is firm, if it withstands being pinched, then yes.

Source alathar.net

The Arabic text is copied verbatim from the original source, without any edits.

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