When using these lens covers, rain, snow, dirt, dust, and mud will find no resting place on your ZEISS lenses. Enjoy the benefits of stainless steel hardware, rugged nylon construction, excellent OEM fitment, and strong secure installation that stays put even when temperatures shift from extreme hot to extreme cold. Smarter features, such as the 'L' wrench and spare battery retaining systems and dual clamping arms, provide you with a stronger sense of assurance. Finally, the flip-up and fold-flat design allows you to always be ready for the next shot. For more success in the field, insist on ZEISS 'Flip-Up and Fold-Flat Pro Lens Covers'.