Frame: TR90 TR90 is a thermoplastic developed in Switzerland that is extremely durable, flexible & lightweight. Lens: Polycarbonate Polycarbonate lenses are robust, break-resistant & offer excellent UV protection. Spectacle shape: Square/ Base 8 Polarized Polarizing lenses are particularly advantageous for sports & leisure activities. They absorb dazzling light reflections, enhance contrasts & improve colour perception. Optimal face shape: round or oval