Like the popular standard PROMASTER Infinity Series, the Infinity Elite has twist-up eyecups, are waterproof, fog proof, nitrogen filled, and have a lifetime warranty. But Infinity Elite Binoculars also include: PROMASTER EXCLUSIVE TRANSBRIGHT 99.3% light transmission coatings for the ultimate in bright, crisp images. PROMASTER EXCLUSIVE REPELLAMAX element repelling coatings that add in keeping your optics free from dust and other environmental elements so you get the maximum viewing capability from your binoculars. Full Broadband and Phase Coated BAK-4 Prisms to ensure true, sharp prisms.