You build or assemble electronics — bare boards, components, sub-assemblies, finished devices — and the packaging touching them can't generate a static charge. A discharge too small to feel is enough to damage a board, sometimes invisibly, and that latent failure becomes a field return nobody traces back to the foam. The protective layer has to be genuinely ESD-safe, not just labeled that way.
You're likely in Baja's electronics cluster or serving it cross-border from Southern California, and you'd rather not import anti-static foam across an ocean when it can be engineered in-country, to your part, on a nearshore lead time.