The BX-4 Pro Guide HD’s are built around the Leupold Twilight Max Light Management System. The specialized lens coatings will allow you to glass longer during the early predawn hours to well past dusk. The slim-hinge design and durable aluminum body is both comfortable to hold and lightweight enough for easy carrying. The redesigned body armor has a texture that allows for a sure grip in any conditions, with or without gloves. Completely waterproof and backed by the Leupold Full Lifetime Guarantee, the BX-4 Pro Guide HD’s are a welcome addition for all who want to see more outdoors.