I bought this for work, but it didn't fit, so I'm putting it up for sale. I opened it and just tried placing it on my existing chair. All accessories, including the winter cover, are included. [Amazon.co.jp Limited] TITIROBA Gel Cushion, Extra Thick [with Winter Cover] 42 x 37 x 6cm, Zero Gravity Cushion, Seat Cushion, Honeycomb Structure, Breathable, for Respect for the Aged Day, Work From Home, Office, Car, Chair, Home Use, Washable Cover, Thermoplastic Elastomer ZD-03-T Blue