Mattress saver? Sheet saver? More like sanity saver.
 
You may only need one or two, so we've priced them per unit—no need to buy a full set of four if you don't need it.

This is made out of PLA which is a natural plastic made from corn. It's not petroleum based. It sounds "weak" but it really isn't—you can actually have products that are environmentally friendly, strong and durable, AND free from harmful chemicals.