An electrosurgical forceps includes a shaft having a pair of jaw members at a distal end thereof that are movable about a pivot from a first position wherein the jaw members are disposed in spaced relation relative to one another to a second position wherein the jaw members are closer to one another for grasping tissue. A movable handle is included that actuates a drive assembly to move the jaw members relative to one another. One or both of the jaw members is adapted to connect to a source of electrical energy to conduct energy to tissue held therebetween. A flexible insulating boot is disposed on at least a portion of an exterior surface of one or both jaw members and about the pivot. The flexible insulating boot includes an internal cavity defined therein that retains a free-flowing material therein configured to disperse from the internal cavity when ruptured.