The Kazbek was designed for long days and demanding conditions. These uncompromising work sunglasses have a lifestyle flair, polarized lenses, optional anti-fog technology and an anti-scratch coating. The Kazbek's frame is constructed of a nylon composite material that can be tied into a knot and the Kazbek is just at home on the water as a pair of fishing sunglasses as it is on the job. A thermoplastic rubber (TPR) nosepiece offers a comfortable, non-slip fit and the lenses block 99.9% of UVA, UVB and UVC rays.