This option is an Add-On providing locking loops to any bra to be ordered on my site to make it lockable. A lock is NOT included; you must supply your own lock. After trying other methods I think this is the best way to keep the bra on. The actual measurements you provide with the bra order are important because I found that the bra can't have too much stretch or the locking method will not work. The band size will be made accordingly for the device to work.