Ess ice replacement 2.4mm interchangeable hi-def yellow lens. Ess modular technology allows all lenses to be quickly and inexpensively interchanged. All ice 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).