Designed to fit over the glass (OTG). Close fitting design with adjustable temples. One piece lens design for safety and comfort. Telescoping temples for a customized and comfortable fit. Ratcheting temples provide lens angle adjustment. Designed to fit over most prescription glasses. Polycarbonate lens provides impact resistance with a single protective lens design. Provides 99.9% UVA/UVB protection. Meets or exceeds ANSI Z87.1+ Standards.