Built to endure the roughest conditions, wettest weather and harshest climates, the all new 7x50 and 10x50 Hurricane porro prism binoculars are ruggedly built with individually focused eyepieces, non-slip/non-skid rubber armor housings, and 100% waterproof/shockproof/fogproof/dustproof construction. All lens surfaces are fully multi-coated with Vortex’s XR anti-reflective coatings and exterior lens surfaces are protected from scratches, oils and corrosive salts by ArmorTek. Argon gas purging eliminates internal fogging and corrosion.