OTS XL safety glass is designed to fit better over today's prescription glasses. THE OTS XL cover glass is 10% larger than most cover spectacles. The single lens design of the Pyramex OTS XL makes it easier to fit over prescription glasses and provides a more comfortable feel. Anti-fog lenses are coated for superb scratch resistance. Polycarbonate, clear lens provides 99.9% protection against UV rays. Lightweight safety glass has nylon temples that are adjustable in length and pitch. OTS Xl cover safety glass fits over frames up to 5 15/16" W x 1 15/16" H. Exceeds ANSI Z87.1 impact standard requirements. Clear lens, black temples, sold per pair.