The Spectron 3 lens is a polycarbonate lens that blocks 87% of the visible light; Lightweight but with excellent shock resistance Rubber temple inserts help keep glasses securely on a child's face Free of finger-pinching hinges, these have flexible temples that let kids pull the sunglasses on and off repeatedly without damaging the frames Lightweight polycarbonate lenses are 20 times more impact resistant than glass and less than one-third the weight Solan is a larger version of the popular Bubble model. The Solan is easy to wear. supple, adapting to any face shape. With wrap-around coverage, they offer perfect protection. Soft to the touch, they can be worn without even realizing it. The Solan is designed for little ones 4-6 years old.