?[PHOTOCHROMIC TECHNOLOGY]: ROCKBROS kids sunglasses transition lens can automatically change from clear to dark gray to block 90% of both UVA/UVB rays that harm Kid's eyes. ?[SOFT & COMFORTABLE MATERIAL]: ROCKBROS Photochromic Sports Sunglasses is made up of TR90 material, flexible and safe for kids, which can be twisted and bent without breaking. ?[UV400 PROTECTIVE LENSES]: Our boys sunglasses adopt safety and impact resistance UV400 protection coating PC lenses, blocks harmful UVA & UVB Rays and protect your eyes from sand, heavy wind, and strong sunlight. ?[NO BURDEN ON YOUR NOSE]: Our kids sunglasses boys is 27g, which is lightweight for kids to wear, without burden on their noses. Curved design brings better wind and dust resistance, low air resistance, suitable for high-speed riding. ?[BUY WITH CONFIDENCE]: ROCKBROS guarantees a secure purchase! If you encounter any issues, we offer a complete refund. Your satisfaction is our highest priority.