Polyester Staple Fiber Pillow Filling Material Uses

What is Top Quality 15D x 64MM HCS Polyester Staple Fiber Pillow Filling Material? Top Quality 15D x 64MM HCS Polyester Staple Fiber Pillow Filling Material (PSF), which is made directly from PTA and MEG or PET Chips or from PET/ Polyester waste and post consumed PET bottles.