Deck shoes are not just for boats. With names, like Chatham and Dubarry, they are as fashionable as they are practical. Traditionally worn without socks, which makes a great deal of sense for anyone on the water, deck shoes have non-marking soles designed for maximum grip when on a wet deck.
Keeping your balance is extremely important when on the water because nobody wants to fall. Keep one hand on the ropes and your feet dry.