A mattress pad can subtly change the plushness of your mattress, make it more breathable, and even block off-gassing. It also adds a layer of protection to keep your mattress hygienic. Here are the best non-toxic, organic mattress pads for comfier, cleaner sleep. Mattress pads need not comprise synthetic polyester or other petroleum-derived plastics. For less sweaty sleep, organic materials such as cotton and wool are a far better choice. Most mattress pads are just that: pads.