In television and documentary applications, the lavalier will typically be clipped to an article of the subject's clothing, such as a tie, jacket or collar. In narrative motion picture usage, lavs are almost always hidden under clothing to conceal the fact that the person has a microphone. The boom microphone typically sounds "better" and more natural than a lavalier mic and is always a soundperson's first choice; however, for exterior location shooting, it often may be more practical to use a lavalier. One such situation would be during a wide shot that forces the boom operator to keep a distance from the speaker that isn't close enough to achieve a good signal-to-noise ratio with the microphone. In that instance, a lav mic hidden on the speaker due to its proximity would achieve good signal-to-noise ratio for recording of speech. When lavalier microphones need to be concealed under clothing, the possibility of material scratching against the microphone is a certain risk. To minimize this problem, sound recordists sometimes wrap the head of the microphones in moleskin or place it inside a hollow-centered, column-shaped sponge and place it under a placard, behind a button, or within the knot of a tie.