C-Mates Brine bifocal readers sunglasses from Costa are ideal for the presbyopic wearer who needs to perform up-close tasks outdoors. The full-rim frames are made from bio-based nylon, an eco-friendly plant-based resin that’s lightweight, durable, and retains its shape in extreme conditions. Rubberized temple tips hold their grip to prevent slippage. Venting in the rims allows airflow to keep you cool and prevent fogging. And the stylish Costa C logo on the temple adds a sporty touch. Why sacrifice style for performance when you can have both with these bifocal readers from Costa.