I think it's more like floral foam, but I feel you.

you are right it is closer to floral foam. feeling the shame on my family. difference between it and floral apparently is floral is open celled vs this which is closed. 

Open cell foam is full of cells that aren’t completely encapsulated. In other words, the cells are deliberatly left open. This makes the foam a softer, more flexible material.

Closed cell foam is made up of cells that are, as the name suggests, completely closed. The cells are pressed together, so air and moisture are unable to get inside the foam. Because of this, closed cell foam is much more rigid and stable than open cell foam.

https://orthopedia.fandom.com/wiki/Foot_Impression_Foam