Practically every nook or cranny in the hull is filled with structural foam to strengthen it and dampen sound. Double-clamped through-hull fittings mean you'll never know the 250 Outrage is unsinkable. But you will notice that ice, fish, food and drinks stay cool a little longer in its built-in lockers than in other boats, which is a side benefit of its foam-filled unsinkable construction. Fish lockers and coolers aren't just coated with foam, they are enveloped in it. In any boat used in sea conditions, electrical components are the first to fail, so Boston Whaler uses only tinned copper wire to resist corrosion in connections.