For trained lifeguards. It is very compact and robust, just carry it stowed in its pocket with its hip belt or directly attached to your harness. Now you can carry instant buoyancy easily and focus more on the situation. Both hands are free, you can swim very fast, dive through waves or very deep. Pull the trigger and the 80cm long bendable Restube lifeguard buoy inflates within seconds. The drag & secure lock system slides out of the pocket and the system provides more than enough buoyancy (75N) to secure an adult. It is reusable by screwing in a new original 16g CO2 cartridge and easy to repack after some practice.