As a safeguard against escape, prisoners are routinely placed in physical restraints for transport. The type of restraints used depends on the security level of the prisoners and may vary from department to department. As a rule, most prisoners will have to wear at least handcuffs as a minimum restraint. Often, a belly chain is added so that the prisoner's hands are shackled to the waist. Leather or nylon belts may be used instead of belly chains. To prevent the prisoner from manipulating the keyhole of the handcuffs, for instance if he or she gets hold of a handcuff key or a lockpick, a handcuff cover may be placed around the handcuffs. The additional precaution of leg irons may also be taken, particularly if the prisoner will be walking outside of a secure area. When a prisoner is shackled at their hands, legs, and around their waist, this is commonly known as being placed in "full restraints".