Thorsten, it's easy to modify your bucket type surf hat to protect your ears. Cut and glue some neoprene (from an old wetsuit) to the strap yoke around the ears. I use a spray contact cement. I can leave a piece with your package by the shower shelf. The FCS surf hat has a thin layer of lycra that covers the ears. I have one with neoprene and dark color and the other with lycra and lighter color for warmer wx.
Having had both ears drilled and my left ear having symptoms of needing a third drilling from surfers ear. I know how important it is to protect those ears from exposure. Not a pleasant condition.