Masah (Arabic مسح) refers to the act of ritually cleaning the feet or head with a small amount of water before prayer (salat) in the Islamic faith. On the feet, masah can be done over thick woolen or cotton socks or over leather socks known as khuffs. This is done when one has put on the socks shortly after previous ritual cleaning (called wudu) and time comes for the next prayer. It is then acceptable to clean the covering of the feet in place of re-cleaning the feet. It is not permissible to do masah if the socks have significant holes. It is also done over one's headcovering in a similar manner involving the first three fingers. Additionally it is only permissible for a 24 hour period if at home, and 3 days if travelling.