Good lenses filter up to 85% of blue light, blue light can cause eye discomfort and eye problems. ^^ Silicone rubber frames are made of durable, flexible, lightweight material with bright colors, suitable for children aged 3-12 years old. ^^ The lenses are lightweight and shatterproof, so they won't put pressure on ears when wearing all day long. ^^ A variety of classic frame options to suit children's various face shapes. ^^ The glasses are produced in our own factory by trained experts and packages are checked before they are sent out.