500 PSI Mask Defog is without question the Clearest, Longest Acting and Most Effective Defog on the market. One-Application Works for at least three dives in one day. Cleans your Mask each time you use it. Wet or Dry Application, has the Consistency of Extra-Thick Toothpaste, and when applied to the lens typically lasts all day long. Large 12 fl oz (355 ml) makes it great for Instructors or Dive Masters when students forget to bring their own.
The 500-PSI Instructor Mask Defog 12 fl oz (355 ml) is commonly used for All Diving Applications and more. The 500-PSI Instructor Mask Defog 12 fl oz (355 ml) is most used by customers who consider themselves to be a Advanced among others. One reason why the 500-PSI Instructor Mask Defog 12 fl oz (355 ml) is popular is because of its Improves Diving Experience.