Designed and purpose-built to perfectly fit their BTX eyepiece module, the Swarovski Optik Stay-On Case protects the module while providing full access to the focus, diopter, and interpupillary adjustments. The water-resistant Cordura nylon exterior matches the green and black color of the scope body, and it has interior padding for additional protection. Snap fasteners and a wrap-around zipper provide fast and easy access to the eyepieces and forehead rest.