After purchase, I opened it and only tried it out, and haven't used it since. Comes with the original box. I am selling it because it doesn't suit me. I will include a separately sold cool pillow cover, compress it, and ship it in the original outer box. Original price of the main unit: 5990 yen When sleeping on my back, I felt a stretching sensation from my cervical spine through the sciatic nerve to my toes, as if energy was flowing smoothly (because I have broad shoulders and use a hard mattress). However, it put a strain on my shoulders and upper arms when sleeping on my side, which is how I sleep most of the time, so it didn't suit me. I tried it with the separate cover layered over the original pillow cover, so there are no stains. I will include one unused cover from a set of two of the separately sold, third-party cover (not Nitori; it's a rather hard-to-find extra-large size). The following is quoted from the manufacturer's description: ● The built-in urethane has evolved into a U-shape. Supports the neck and side-sleeping zones. ● Supports from head to back without gaps. ● Provides firm support at 7 points, reducing the burden on the body. ● Two-layer structure with adjustable height (includes one urethane sheet). ● By supporting with a large size, it fills the gaps with the body, disperses body pressure on the shoulders, neck, and back during sleep, and reduces the burden on the body. ● Height can be easily adjusted by inserting it into the back. ● Antibacterial and deodorizing treatment (cover outer fabric) ● Washable (cover) ■ Pillow height: Medium/High (height adjustment) ■ Pillow firmness: Normal ■ Size: (approx.) 65 x 75cm ■ Composition ・Cover Outer fabric: 100% polyester Inner fabric: 100% polyester 　　　　Anti-slip: Vinyl chloride resin Gusset: 100% polyester ・Main unit Outer fabric: 100% polyester Inner fabric: 100% polyester Filling: Urethane foam ・Height adjustment sheet Side fabric: 100% polyester Filling: Urethane foam ■ Machine washable (using a net) *cover only ■ Bonus: Separately sold pillow cover - New 3D ice bean quilting pillow cover, coreless, excellent breathability, 100% polyester, comfortable for summer, machine washable, soft and highly durable, perfect for bedroom and guest room decoration, TWIN/FULL/QUEEN/KING size compatible, light gray, unused #Nitori #NITORI #MemoryFoamPillow #GoodSleepGoods #Sleep #Pillow