A MATTRESS TOPPER TO PROTECT YOUR MATTRESS. Mattress toppers have become increasingly popular as people look for the ultimate sleep experience. A mattress topper will not only improve the comfort of most mattresses, it will also protect it against wear and tear. And, while even the best mattress toppers won’t fix a worn-out mattress, it will help you to get a better night’s sleep. A mattress topper is typically used as a protective layer over a spring or foam mattress. A mattress topper can help fix the problem of a too-hard (or too-soft) mattress and – in the case of a memory foam mattress topper – can actually change the sleep experience completely. A thinner mattress topper can also act as a mattress topper.