Steiner XC 10x42 Binoculars Features Makrolon housing, which is a durable polycarbonate with NBR Long Life rubber armoring, creating a lightweight, rugged chassis that withstands 11 Gs of impact Has an N2 Injection System that seals 14-psi pressurized dry nitrogen into the optic, for fog proof clarity in any condition from arctic cold to desert heat Waterproof and fog proof The Clicklock system attaches and releases neck strap or harness instantly with push button ease and is designed so binoculars hang straight and action-ready Lifetime Steiner Heritage Warranty