ScubaPro Scout Scuba Diving Mask Incredibly Low-Profile Design Sleek Design, the Scout is Easy to Clear Two Tempered Glass Lenses Maximum Underwater Vision and Intake of Light Ultra Clear Glass Lenses: Standard Glass has Green Tint from Iron Impurities Green Tint Distorts True Colors and Blocks-Out Light Reaching the Eye Ultra-Clear: Optical Quality Tempered Glass, Exceptional Clarity and High Light Transmission No Color Distortion Maximizes Light Available for Improved Visual Acuity