ESS Eye Pro Crossbow meets the U.S. military specification MIL-PRF-32432A and U.S. Federal OSHA requirements. This will ensure you'll be equipped for any operation or task with proper protection. Using DedBolt Lens Lock to keep the lenses in place, these glasses resist impact and use ClearCoat FlowCoat lens treatments to prevent unsightly fog or scratching. ESSOPTICS completely eliminates distortion to produce a clear line of sight at any angle and the lenses provide 100% UVA/UVB protection. The sunglasses won't slide around, even when they're wet, thanks to the No-Slip rubber nosebridge.