https://www.babykins.com/products/rubber-sheeting At one tine, even as late as 1968, but mostly before 1958, the rubber sheet was the most used mattress protector for cribs and beds. This was so much a part of things that it was just presumed to go along with diapers and rubber panties as a unit. There were basically 3 kinds. a small brown one with a kind of pebbled surface that was not stretchy, a thin one of small size that was a kind of ivory with a hint of gray and a light ivory one tha