This is the IST Corona ANTI-FOG Twin-Lens Scuba Diving Snorkeling Mask

Features:

• IST's revolutionary Anti-Fog Lens Film
  
• Corona has been one of the most popular IST masks and its superior fitting and comfort are the reasons behind the success.
• Its swivel buckle allows the diver to adjust the mask to the most desirable position.
• The low internal volume gives unrestricted view.
• Silicone skirt with low volume and comfortable edge seal
• Lightweight and durable poly carbonate frame
• Dual tempered, scratch resistant glass lenses for maximum clarity and safety

Foggy lenses are an unavoidable issue experienced by divers for far too long - even anti-fog spray only temporarily solves the problem. IST is taking the lead with their revolutionary Anti-Fog Lens Film, so you don't have to deal with foggy masks any more.  For optimal effect, ensure to remove the matte protective film inside the mask before first use, and rinse with fresh water prior to each dive. Exercise caution when cleaning and using the mask, as exposure to sharp objects, extreme temperatures, and harsh cleaners can damage the lens.