The Tifosi Optics Veloce Photochromic Sunglasses are simplicity at it's best. These photochromic sunglasses transition from light to dark terrain with ease, so you can worry less about suddenly going over the handlebars once you head into shaded territory. Additionally, these sunnies are compatible with the Veloce Rx Adaptor, which is incredibly convenient if you require a prescription, however if you're one of the fortunate few who don't need the assistance, just remember--you're lucky. Anyway, the frames are constructed with a durable, homopolyamide nylon called Grilamid TR-90 that's known for its low density, high resistance to chemical and UV damage, and incredible bending strength while the Tifosi polycarbonate lenses protect you against harmful UVA/UVB rays. These decentered lenses are also furnished with ventilation and a glare guard, which prevents unnecessary glare and increases airflow, in turn preventing fogging and encouraging optimal visibility.