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Your MacBook keyboard will be safe from: key wear, staining, odors, dust mites, bacteria, mold and fungus, dust and debris, snacks and crumbs, hair and fur and last, but not least, drips and spills.
is made to cover perfectly each key and is designed for a normal typing with extra comfort. It is easy to use and clean; you can wash it with a water and detergent and then dry it and put it back on your keyboard.
Source link: http://bindapple.com/mac-book-keyboard-protection/