Embodiments of golf clubs with a cavity and their methods of manufacture are generally described herein. In one embodiment, a golf club head comprises: a strike face, a back face opposite the strike face; a heel region; a toe region opposite the heel region; and a cavity integral with the golf club head. Among various embodiments, the cavity: extends from the heel region to the toe region; extends along a lower portion of the back face of the golf club head; extends approximately parallel to the strike face; and is approximately symmetrical about a centerline that bisects the golf club head between the heel region and the toe region. Among various embodiments, the cavity further comprises a vibration dampening material. Other embodiments are described herein.