The Xtreme boot offers maximum performance in a lightweight rugged solution for using the Radiation Alert^® Sentry in rugged conditions. The Xtreme boot is designed specifically for individuals operating in tough environments, such as, Radiologists, 1st Responders, Mining and HAZMAT crews. Made of a RoHS compliant TPE rubber, the case also offers superior grip and drop protection. The boot has a matte black finish identical to the enclosure of the instrument for a seamless look, while giving the user complete access to the unit's operation.