ESS ICE NARO Replacement 2.4mm interchangeable Smoke Gray Lens. ESS Modular Technology allows all lenses to be quickly and inexpensively interchanged. All ICE NARO lenses provide 100% UVA/UVB protection and exceed ANSI Z87.1-2010 and the U.S Military.15 caliber ballistic impact test MIL-PRF-31013 (Clause 3.5.1.1).