Low volume mask with a good field of vision Anti-reflex and anti-slide silicone skirt Tempered glass YELLOW LENSES that block blue light and UV rays, providing a much bigger depth perception and sharper vision. These yellow lenses improve the contrast in low light condition ( the deeper you go ) and have also a mirror effect that prevents fish from seeing your prey eyes movement and detect your hunting intentions, so they will get much closer to you, making it easier to catch them!