Atomic Aquatics Scuba Diving Frameless Mask, Clear/Purple, Medium Fit Atomic Frameless Mask color Clear/Purple - Medium Fit Ultra Clear Large Tempered Glass Lens Single Window Black Silicone Skirt Diving Snorkel Large tempered glass lens and close-fitting skirt work in harmony to create perhaps the widest viewing angle of any frameless mask design. The mask skirt is made from high quality silicone rubber and has a low volume profile to add to the increased field of vision. Low volume also makes mask clearing easier due to less water needing to be displaced. Lenses: Exceptional Clarity and High Light Transmission, No Color Distortion, Optical Quality Tempered Glass Lenses Sizing - Regular. This product has a limited lifetime manfacturer's warranty