Muc-Off Anti-Fog Treatment uses cutting edge moisture absorption technology with an anti-mist formula to create a transparent, micro-thin coating so your ride is never cut short by foggy goggles! Our Anti-Fog Treatment lasts up to five days, and if you spray on the outside of your swim goggles or sports glasses, the anti-mist formula will help rain bead off to make your ride that much safer! And, with our long-lasting formula, you're goggles will be fog free for up to five days!