Optical Glass Prismatic Lenses - Ground and polished to precision optical standards - bevel edged and mounted in interchangeable plastic frame. It tilts - Adjustable pivots allow the visor to be tilted out of the way when not needed and at your fingertips when you need magnification. Adjustable Headband - Conforms to fit all head sizes - fabricated from a special blend of lightweight material - comfortable when worn for long periods of time. High Impact visor - Provides a tough, durable, always new appearance. Genuine Leather Comfort Band - Padded with orthopedic felt adds to comfort.