Workers wearing the ST1 eyewear can expect extreme comfort with this face-flattering protective eyewear from MCR Safety. Ratchet action temples combined with non- slip rubber head grips create a customized fit for virtually any head size. The wraparound lens is constructed of lightweight, scratch resistant polycarbonate that filters 99.9% of U.V. rays and delivers advanced visual acuity and protection. Choose the best safety glasses, choose MCR Safety!