The BAK 4 prisms give you enhanced colour fidelity, the lenses are multi-coated to obtain high contrast views and excellent brightness ,- Multi-coated optics ,- Waterproof and fogproof: even in extreme situations, nitrogen purged which prevents the optics from getting fogged up inside the binoculars ,- Rubber covered for protection ,- Easy to use focus knob ,- Adjustable eyecups ,- Light ergonomic body ,- Humidity resistant neoprene carry case