Mattress protectors are a great investment of time and money. They come in so handy for many occasions when 'protection is better than cure'.
Imagine washing an entire mattress versus just a sheet of cloth, and you'll understand.
The 100% cotton covers which double-sided laminated over a breathable waterproof lining, which cannot be seen. The mattress protectors are laid over the mattress when the child is being toilet trained and sleeps without diapers. They are often used when the child has stomach flu, or for any occasion when you want your sheets cleaner for a short period of time.