is a new line of children's prescription glasses designed in Spain using the latest technology. Nano Metal Frames Collection are made of Elaxtitan™ material bringing a new generation of flexible metal technology to this collection. Nano metal not only offers extreme flexibility and durability with fashion forward designs. Great choice if you are looking for something different  Nano Metal Rio NAO190348 Gold Green  will make a great transition for Nano Vista fans that want to remain fashionistas.