Smith Optics Sunglasses, style Threshold Slider is an eco-friendly rectangular semi-rimless plastic frame. The Threshold Slider features non-slip Megol nose and temple pads for maximum comfort and stability. The Smith Optics logo is featured on the temples. The patented Slider system makes it a breeze to switch lenses and manage any light condition. Smith Optics Sunglasses have scratch/impact/moisture resistant anti-reflective TLT glass lenses that provide 100% UV protection and superb optical clarity. Size: 64-18-113 mm