PO3250S Sunglasses by Persol. Shape: Square, Material: Plastic, Color: Black, Brown Tortoise, Caffe', Havana, Terra Di Siena, Size: 55-18-140. Each pair of Persol glasses is a perfect symbiosis of technology and aesthetics. The fascinating design and artistic quality of Persol glasses make them a premier choice among celebrities. The keyhole bridge, legendary arrow and Meflecto system are the details that have made Persol eyewear unmatchable. Patented in the ‘30s, the Meflecto is the first flexible stem system designed for maximum comfort of the wearer allowing glasses to adapt to any face shape. Also, Persol glasses are paired with the Barberini® mineral sun lenses that feature the best anti-impact, anti-static and anti-scratch technology.