The subject invention relates to a protective window covering system comprising a conventional building window having a window frame and an inflatable protective window covering, wherein multiple hooks are mounted around the perimeter of the window frame, wherein the inflatable protective window covering is comprised of a single, uninterrupted inner cavity and walls wherein the walls of the protective covering enclose the inner space of the protective covering, and wherein the walls of the protective covering include at least two rows of fibers extending throughout at an angle that is offset by 15° to 75°, and a securing means wherein the securing means attaches loosely to the window frame in an uninflated state, wherein inflation of the protective covering applies tension to the securing mechanism thereby securing the protective covering.