This cover basically covers the whole top deck, giving maximum coverage from all weather conditions. This cover sits on top of the boom and secures down onto the stanchions usually made from a very strong but light weight material for ease to put on and store. Great for giving protection to sheets, blocks, deck gear, Perspex hatches, windows, gel coat or varnish work. Can also be used to keep temperature down inside hull. There are a couple of extra design options for this cover involving getting more use out of the cover and for ease of putting on.