Close your eyes. No really at all, for a moment. Think of this: it's a hot summer day, one that makes the sweat run in the buttock and for which you have reported sick at work. After hours in the sticky sprinter towards Zandvoort, you trudge with your very last forces over the burning sand to the sea. And then, without hesitation, dive your cup into the water. That wonderfully cool seawater. Aaahhh ... Do you see it for you? That is exactly the feeling you get every time you drink from this sea-green Dopper.