Frame: TR90 TR90 is a thermoplastic developed in Switzerland that is extremely durable, flexible and lightweight. leftLens: Polycarbonate Polycarbonate lenses are robust, break-resistant and offer excellent UV protection. left Spectacle shape: Round leftPolarized Polarizing lenses are particularly advantageous for sports and leisure activities. They absorb dazzling light reflections, enhance contrasts and improve colour perception. left Optimal face shape: rectangular or oval leftprescription glasses possible These glasses are optically glassable. The best way to do this is to contact the optician of your choice.