Tempress teamed up with leading US Spinal Surgeons and Ergonomic Experts to create the break-thru ProBax Seat. ProBax is clinically proven to provide optimal long-term back and upper body support. This seat comes equipped with a patented base and back dual core foam support system only available thru Tempress. This system is also water resistant and durable for prolonged use. The ProBax is sewn with UV and abrasion-resistant polyester thread and covered in 30-oz. marine-grade vinyl to stand up to all the elements. A universal seat bolt pattern is molded into the frame to accept any 5-1/4″ mounting system or pedestal. Stainless mounting hardware included. Made in USA.