The white foam I'm refering to is like the molded packing material. What I saw was used for floatation in a boat. After a flip, the boat sank(not enough floatation) in shallow water, so it was easily retrieved. When the foam was pulled out, the owner was able to get water out by squeezing like a sponge. It also quickly crumbled as he was pulling it out of the boat. If I do foam floats, it would be using the pink or blue insulation foam from the local home center. That stuff is almost indestructable[8D]