an anchor bra provides an easily removable and replaceable cover over a protruding boat anchor , thereby protecting other boats and people from damage by an exposed anchor . the anchor bra is preferably formed of a buoyant and pliable marine grade plastic that covers a boat &# 39 ; s anchor when it is raised . the anchor bra is secured in place by adjustable straps that are fastened to the boat &# 39 ; s gunwale or railing . the anchor bra is made in various sizes to accommodate various anchor shapes and sizes .