How does the Wash ‘n Zip Pet Bed aid with flea prevention?

Other beds are the perfect breeding ground for fleas since their eggs & larva may penetrate the outer covering of the bed and inhabit the interior padding.  However the entire Wash ‘n Zip can be run through the washer & dryer, thus interrupting the entire flea life cycle.  We live in Florida, have two dogs and a cat, and haven’t had fleas for years.