NOT this called canned foam insulation / gap filler which dries rigid :


I mean sponge, flexible, resilient; sort of furniture cushions, matresses... Do you know any LINK, please ?

 

Home depot, craft stores.

 

any hardware store, Amazon, Uline,...

 

Are you sure they come out spongy? The ones I have used dry hard.

 

I've never seen "foam in a can". The closest thing I can think of is specialized window sealant foam, which remains somewhat flexible to maintain a seal despite temperature changes and mechanical stresses.

I believe what you're looking for is called an open-cell foam and the canned stuff is all closed cell.