Floating Prism System uses flexible silicone lens mount to absorb severe shock, impact and abuse without damage; Sports-Auto Focus System lets you focus each eyepiece to your vision once, then keeps images razor sharp from 20 yards to infinity; Makrolon housing with NBR Long Life rubber armoring, creating a lightweight, rugged chassis that withstands 11 Gs of impact; Traditional Porro prism optical path affords a more rich depth of field versus similar roof prisms; Fully multi-coated optics improve light transmission for bright high-contrast images with accurate color rendition; Fold-down rubber eyecups for comfortable use with or without eyewear; O-ring sealed to be waterproof for use in light rain or snow; Oil, petroleum, and chemical-resistant NBR synthetic rubber armor offers improved grip security, especially in cold and wet weather; Green Finish