The BearKat's super well thoughtout construction combines the best in safety, comfort, and affordability. Your vision is unobstructed by the one-piece wraparound lens, which by its tight fit allows you maximum safety. Comfort is enhanced by the flexible temples and the non-slip temple sleeves are notched for a clip-on breakaway cord. - The dual lens design gives you a full orbital seal. These glasses feature the grip and comfort of nonslip rubber head grips, and strong, lightweight lenses with a Duramass scratch resistant coating. Replacement lenses are available.