You can get these  Birks WET.

Super great for the beach & boat. Get the support with the functionally.

style 0129423 Narrow (women's width)

Birkenstocks quality, odor-neutral EVA has been tested for harmful substances and combines numerous positive attributes. It's waterproof, ultra lightweight, washable and therefore extremely easy to care for.

• Anatomically shaped BIRKENSTOCK footbed in EVA
• Upper/lining/sole: one-piece EVA
• Details: waterproof, washable, ultra lightweight
• Made in Germany