You give it your all, and you should expect nothing less from your sunglasses. Built with cyclists, runners, and endurance athletes in mind, the Tifosi Alliant Sunglasses feature a Grilamid TR-90 frame that is lightweight and insanely durable. The hydrophilic rubber in key areas makes sure they won't fall off when you're really pushing yourself. The vented lenses improve airflow and offer complete UV protection. So keep working hard, just make sure your sunglasses work just as hard. Comes with 3 interchangeable lenses.