As a flagship of the Weaver line, the Grand Slam binoculars have gone afield in the pursuit of all types of game. The new Grand Slam binos offer nitrogen purged tubes, rugged body armor, and extendable eyecups for comfortable viewing sessions. Features include phase coated lenses for the ultimate in light transmission, a roof prism design with BK-7/BaK-4 prism glass, as well as being waterproof and fogproof. Torture tested from -20° to +150° Fahrenheit for durability. Tri-pod compatible.