【Flexible and Frame-less Design Frame】: The newest Tr90 frame-less design for cycling glasses which make cycling sunglasses becoming more stylish and lightweight. The glasses leg is made of rubber which is flexible and comfortable. 【UV400 Polarized Lenses】These Polarized Sport Sunglasses are took premium polarized lenses which are 100% UVA and UVB filtering, reduce reflections and glare for a clearer view. So your child can perform to the best of their ability in the Contest. 【Ventilation Structure】: Our Sports Sunglasses have an excellent ventilation system with vents on the lenses and legs. This ventilation system not only prevents the lenses from fogging up, but also makes them more breathable when worn. 【Designed for Sports】The Youth Sport Sunglasses are ideal for outdoor sports, such as baseball, softball, climbing, driving, fishing, golf, hiking, running, skiing, cycling and so on. 【Anti Slip Design】: The legs of the polarized sunglasses are made of non-slip rubber, which makes it harder to fall off during exercise. However, during strenuous exercise, we recommend that you wear the anti-slip cord that comes with your sunglasses.