Is polypropylene safe in mattress bed toppers?

Polypropylene is generally considered safe for use in mattress bed toppers, as it is a synthetic polymer that is non-toxic and resistant to moisture and mold. However, the safety can depend on the specific manufacturing processes and any chemical treatments used. It's advisable to choose products that are certified for safety, such as those meeting CertiPUR-US or Oeko-Tex standards, to ensure they are free from harmful substances. Always check for any potential allergens or sensitivities before purchasing.