Lens insert is out of user's direct line of vision. Temples adjust to four different lengths. Nose buds secure the glass and prevent slipping. Passes Ballistic MIL-PRF-32432. Custom imprinting available. STANDARDS & CERTIFICATIONS ANSI/ISEA Z87.1-2020 + High Impact CAN/CSA Z94.3-2020 CE/UKCA EN 166