ANSI Z87+ RATED LENS & FRAME ▶ Our premium safety sport sunglasses feature ANSI Z87+ rated both lens and frame which conforms to the American National Standard Institute (ANSI) requirements for high Impact protection. PHOTOCHROMIC LENS ▶ X Power's Photochromic lenses adjust to the situation you're in. In darker or shady areas, they'll be nearly clear and let in more light. On a cloudy day they will be half tinted and block out the appropriate amount of sunlight providing optimal clarity. On bright sunny days, they will fully tint within 7 seconds and provide maximum protection from harsh sunlight. ANTI-SLIP ▶ Our transition Z87+ sunglasses have soft anti-slip nose pads & temples. They are slightly adjustable while maintaining proper rigidity to stay in place. 8 BASED CURVED DESIGN ▶ These 8 Base Curved Lenses and frame offer significant peripheral coverage that you need to keep out harmful sunlight as well as debris that may get in your eyes. Designed to wrap around your face and provide maximum field of vision. UV400 technology provide 100% protection against UVB and UVA rays for superior optical clarity and to eliminate distortion. X POWER strive at delivering excellent eyewears for our customers. Our top priority is your safety, from unexpected flying object to harmful sun light shining into your eyes. To accomplish such tasks, all parts in our eyewears, including lens, frame, and temple, are constructed with high-velocity impact resistant polycarbonate material. Photochromic Lenses sunglasses Z87+ certified UV400 Flash Mirror-Coated Lenses Safety Sport Sunglass, Combining robust structure and the proprietary X Power True Vision coating technology to prevent eyes injuries caused by unexpected flying objects and UV radiation generated buy sunlight or computer/electronic device. Makes them perfect for indoor and outdoor activities. Lenses turn light yellow when indoor or under shades; darkens grey with flash mirror coating under the bright sun.