Alpen Optics TETON 10x50 Waterproof, Long Eye Relief, BAK4, PXA-SHR Coating, Twist Lock Eye Cups Light Weight Composite Body Waterproof / Fogproof - Nitrogen filled Fully Multi-coated - SHR metalic coated - PXA Phase coated Long eye relief to see the full field of view when wearing glasses BaK4 High Index Glass