The Article One Active Bird in Vintage Crystal is an ll-purpose athletic frame, Bird, features techincal benefits for an active lifestyle with an angular and sharp silhouette. Made in Italy with TR90 polymer plastic, an incredibly durable, lightweight and hypoallergenic material made to hold its' shape, even in the highest temperatures. Tonal silicone nose pads are made to grip and hold – with a wire core skeleton athletes can squeeze tight during a workout, and let loose afterward. Silicone pads wrap around the ear for additional comfort and grip. The frames include Divel, Italian-made, CR-39 Polarized lenses that block 100% of UVA/UVB rays and prevent road glare, plus the back side has an extra anti-reflective coating to counteract any reflection coming from the eye. Spring hinges allow for give and bounce back in case of rough wear, and each frame comes with a hard case and soft pouch for whatever an active day calls for.