The Vixen Optics 10x42 ZWCF Foresta is a unique triplet objective design binocular intended for outdoor enthusiasts. The Foresta series features fully multi-coated optics to obtain sharp and crisp views. It is made of durable die-cast aluminum encased in rubber armored housings. Its Bak4 prisms increase light transmission. The binocular is waterproof and nitrogen filled to prevent fogging during sudden temperature changes. It has pop-up eyecups to accommodate all viewers including eyeglass wearers. Its large center focusing knob enables rapid target focus, even if you are wearing heavy gloves during cold temperatures.