They probably provide it but I would probably pack a bottle of shampoo and conditioner that is more appropriate to my hair type. Bear in mind that swimming pools for instance have chemicals which can dry out your hair, the sun does the same, so I personally would go for a fairy moisturing type. There are also products that protect against UV rays. Maybe I'm a little vain but I see it in the way I would treat a moisturising cream. I'd pack my own even if the ship provided one, just one that is right for my skin type.