The head vortex goggles have a durable one piece construction with injected liquid silicone for additional comfort and excellent fit their split silicone head strap has an easy auto clip system to make adjustment quick and intuitive the polycarbonate lenses have anti fog and anti uv properties the head vortex goggles are a combination of 60 years experience in aquatic eyewear production and attractive design with italian flair all this to provide you with the quality you will enjoy