Julbo Kid's Rookie Sunglasses with Spectron 3+ Lens Polar junior lens is a polycarbonate lens that blocks 86% of the visible light Lite-weight with excellent shock resistance versatile lens suitable for all types of activities Flash treatment improves visible light filtering with a mirror effect on the lenses Spectron 3+ lenses are optical category 1 100 % a,B,C UV protection Wraparound design provides excellent coverage Flexible curved temples(the glass is designed for kid's 8-12 years but this is subjective and only a guide as head shape and size can vary greatly)