The cap is a prescribed device fitted by a health care professional and is more expensive than other barrier methods such as condoms.Version InfoLast reviewed on 2/26/2012Susan Storck, MD, FACOG, Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Bellevue, Washington; Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Wa