Frame: TR90 + Rubber TR90 is a thermoplastic material developed in Switzerl&, which is extremely durable, flexible & light. Rubber ensures optimum grip. 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