The Mescal outdoor pillow is made of PET, which is a highly resistant and flexible synthetic material. PET is typically made of fibers mixed with binders that provide texture and durability. It is also known as a hypoallergenic and stain-resistant material. These qualities make it often used for pillows, as it is easy to clean and retains its shape and comfort for many years. Inner pillow sold separately, made of polyester fiber, entirely for outdoor use.