The MCR Safety BearKat BK1 Series Biofocal Readers Gray Lens Safety Glasses' well thought-out construction combines the best in safety, comfort, and affordability! Your vision is unobstructed by the frameless one-piece wraparound lens, which by its secure fit allows you maximum safety. Comfort is enhanced by the flexible temples and the non-slip temple sleeves are notched on the end to accept a clip-on breakaway cord.