For what it's worth (and not a criticism, they're fantastic eye-pro), nov is just selling re-brands of https://www.amazon.com/Pyramex-I-Force-Sporty-Anti-Fog-Goggle/dp/B006WPSDXS and https://www.amazon.com/Pyramex-Safety-Products-GB6420SDT-Anti-Fog/dp/B005E06C6M, so if/when you need to replace them you can get them for a chunk cheaper directly