The cover is machine washable, however removing the cover is usually unnecessary for cleaning. Follow the simple cleaning instructions attached to each seat. However, it's not intended to be used for floatation. If it falls in the water, you have plenty of time to retrieve your Sport a Seat. A. Sea spray or a wet swimsuit won't hurt the Sport a Seat.
Most liquids bead up and run off.
If it gets really wet, simply allow to dry in the sun before stowage. We don't recommend it. Sunbrella fabric breaths very well. Applying a sealer may trap moisture inside. Some attach a lanyard to the handle.