The Air Drop Series binoculars are virtually G-proof thanks to the patented air chamber shock absorbing system which protects against 200G shocks. This means that these binoculars can endure drops 2.5 times higher than required by the US Military specifications. The Air Drop Series Binoculars also exceed the US Military Spec test for "waterproof" by 200%. Advanced aspheric lens technology improves optical performance while reducing weight and bulk while rubber armored "parapets" and recessed lenses protect against optical damage.