The Sync is a seating system consisting of a number of cubes that move up and down with a persons body weight by the aid of gas springs, to create arm rests and a back rest from the surrounding cubes. Brills! Of course that means anyone attempting to sit next to me will get my pissy face because they’re essentially sitting on my armrests. I like the idea, hate the covers. Fortunately there are other upholstery options.