It doesn't appear so, at this time. The "ProGear Racing GearSeat" is made/marketed by ProGear, the "Professional Tools Division" of Traxion, Inc. According to their web site, "TraXion is committed to Assembled and Made in the USA. We regularly review products to determine if USA production is viable. Here is our starting point. These products listed here are either made in the USA or assembled in the USA using foreign and domestic components. We look forward to this page growing!"
Unfortunately, their site currently lists only one "Made in the USA" product ("The BodyForm Creeper USA"). A second, "The ProForm Creeper USA", is listed as "USA Production Coming Soon". A third, "ProGear Wide-Body Creeper", is advertised as being "Assembled in the USA from import and domestic components". I infer, from the the lack of "Made in the USA" marketing regarding the GearSeat, that it's not currently produced domestically.