When you're out running, hiking, biking, and climbing throughout the year in varied conditions and differing environments, the only constant is change. Since you've accepted the challenges of change, your sunglasses also need to be capable of adapting. The Native Eyewear Polarized Linville Interchangeable Sunglasses allow you to change out your lenses to suit varied light conditions, while offering high performance eye protection, glare reduction, and a stay put fit, no matter what conditions you encounter. And because outdoor pursuits aren't always graceful or temperate, Linville's rugged frames are made to survive high velocity collisions and temperature extremes. The Linville's advanced N3 polarized lenses selectively block out specific parts of the light spectrum and eliminate glare to provide a crystal clear view with increased contrasts and optimal depth perception, while offering top notch protection against both infrared and UV rays. The Rhyno Tuff Air frame, made of a high performance thermoplastic, is super lightweight and built to withstand outdoor adventure abuse. The frame is shaped to provide comfortable, stay put grip, while special, non slip nose and temple boots ensure the sunglasses stay securely in place, even when you're doing your best to jostle them off. Integrated vents help prevent fogging when you're working up a sweat while still keeping light fully blocked out. The Linville is designed to provide full coverage for large faces, and the flexible nose pads are adjustable for a perfect, customized fit. The sunglasses come equipped with a pair of SportFlex low light lenses for overcast days or rides in the deep woods, a semi rigid case, and a soft pouch so you'll be able to keep them in good shape once they're done protecting your eyes and enhancing your view for the day.