Day and night sport glasses: Photochromic lenses adjust based on sunlight and UV exposure, darkening from light yellow to provide optimal clarity in varying light conditions. Unlike standard sunglasses, they automatically adapt when moving indoors or into low-light environments, becoming lighter to enhance visual comfort and clarity. UV400 polarized lenses offer 100% protection against harmful UVA and UVB rays. The TAC polarized lenses reduce glare from roads, water, snow, and LED lights, improve visibility in dark areas alongside roads at night, and enhance visual clarity during rainy or foggy conditions, delivering a wider, clearer, and safer field of view. Sturdy and durable flip-up clip design features a precision-engineered spring bridge for smooth, reliable operation without breakage or sticking. Each arm includes a rubber sleeve to prevent slippage and scratching of primary eyewear. The clip can be flipped up when not in use, eliminating the need to remove it entirely, with no obstructive arms in the peripheral vision. Ultra-lightweight design weighs only 8g, providing a nearly weightless feel and eliminating the need to carry multiple pairs of glasses. Perfect for active lifestyles and everyday wear. If you experience any quality issues or are unsatisfied with the product, support is available for return and exchange options.