Today, as over the more than 60 years that we have been manufacturing quality posture correction products for the industrial safety market, we offer the following benefits to all of our customers. TOP QUALITY CONSTRUCTION. Each SACRO-EASE seat insert is constructed with heavy rubber supports spanning internal, carbon steel frames composing the seat bottom and 4-way adjustable backrest/lumbar support. These two components are then connected with solid steel rivets and hinges for durability under the weight and movement of the heaviest driver. The unit is then covered with attractive, high-wear, easy-to-clean, 100% nylon fabric in one of several attractive colors ( black, charcoal gray, medium gray, dark brown, light brown, blue and burgundy ).