you have several types of foam

Styrofoam (White cooler type) can hold lots of static electricity, if you get a chip shipped on this, wrap foam and chip in aaluminum foil and ground it, remove chip using ground strap on wrist. if you want to store chips on white foam, wrap the foam with foil before adding chips

Pink Foam (can be foam rubber type or plastic bubble type) this is fine for shipping, basic ESD protection, minior conductivity, provides mostly antistatic control. not reccomended for CMOS devices

Grey Foam (foam rubber) pretty much like white styrofoam, not recomended for chips.

Black Foam (True Antistatic Foam) this is the choice item for storing chips in foam, its antistatic, and its conductive foam. best choice other than antistatic plastic chip carrier tubes.

Tubes are the best, if they are antistatic. They keep pins from being bent, and are fairly cheap. Save tubes and black foam from items shipped to you.