The highest-end model in the VARILITE series, allowing for independent air volume adjustment in the front and rear. Purchased in 2022 and stored in a closet. I used it this year and found that the thickness didn't suit me, so I put it away after using it for one day. It's a good cushion for wheelchairs, so I'd like to pass it on to someone who can use it. The instruction manual is also included. Manufacturer: Varilite Product Name: Meridian Product Code: 720002-1616-1 Import and Sales: Yuki Trading Co., Ltd. Size: Width 40cm, Depth 40cm, Height approx. 10cm, Weight approx. 850g Features: The highest-end model in the series, allowing for independent air volume adjustment in the front and rear. (From the importer's website) The Meridian is a hybrid of "air" and "urethane" consisting of "three types of urethane." With its "two air chamber structure divided into front and rear," it is "the cushion with the highest pressure relief and postural support in the series." By adjusting it to raise the thighs and sink the pelvic position, it has the advantage of making it difficult to slide forward and making the posture more stable.