Sperian Genesis safety glasses, an independent study ranked these glasses as number one in overall comfort. The soft nosepiece adjusts and conforms to the wearer for maximum comfort without slipping. Temple length and rachet inclination are also easily adjusted to enhance comfort even during periods of extended use. Durable and resilent lenses contour the cheekbone and can withstand impact energies seven times greater than ansi or csa high-velocity tests (ansi Z87.1 and CSA Z94.3) and meet military V0 test regimen.