Dr. Akiori Yamada Orthopedic Surgeon Supervised Pillow, Doctor's Pillow, Yamada Akiori Pillow Research Institute A pillow that provides comfortable sleep with a 3-layer structure. - Color: Gray - Material: Polyester - Features: 3-layer structure (soft layer, support layer, height adjustment layer) - How to use: Comes with a guide on how to use the pillow correctly Used for a short period of time. The dedicated pillow cover was sold separately, so it's not included. The gray cover is not a pillow cover. It seems you put a pillow cover on top of this. I was using a different cover at home. This is a high-resilience pillow. Thank you for looking.