WARNING: When my "Serta" chair arrived, the box, packaging, chair and even the manual lacked any indication that it was an authentic Serta chair. The manual claimed it to be a "Back in Motion(tm) Chair; Silla Back in Motion (tm)" by True Innovations. The serial number was the same, but the product was obviously a rip off. Also troubling, the website in the manual for assembly assistance, warranty issues, questions and comments is invalid. In addition, the chair is as hard as a rock. From other reviews, I assume the Serta brand is much better quality. Kudos to Wayfair for making this right with a full credit for my purchase!