The 100% all-natural cotton cover delivers softness with an all-natural duck feather fill. Each 4-pack contains four pillows and is available in three size options to supply comfort for any sleep position. Easy care as these pillows are machine washable. Oxipower wash exceeds the industry standard for cleaning natural fill contents, washing our material 18 separate times ensures a complete disinfected and hypoallergenic feather fill which is responsible down standard certified - "The RDS safeguards the welfare of geese and ducks that provide down and feathers for the products we all love". Contains RDS Certified Down: The goal of the Responsible Down Standard is to ensure the waterfowl in the down supply chain are treated humanely.