The specific product used was developed by Monsanto and called AstroTurf; this term since then became a colloquialism for any artificial turf throughout the late 20th century. AstroTurf remains a registered trademark, but is no longer owned by Monsanto. The first generation turf systems (i.e., short-pile fibers without infill) of the 1960s has been largely replaced by the second generation and third generation turf systems. Second generation synthetic turf systems featured sand infills, and third generation systems, which are most widely used today, offer infills that are mixtures of sand and recycled rubber.