TEMPRESS has teamed up with leading US Spinal Surgeons and Ergonomic Experts to create the break-thru patented ProBax Captain&';s seat with arms. ProBax is the only fishing seat clinically proven to provide optimal long-term back and upper body support. This boat seat comes equipped with a patented base and back dual core foam support system only available thru TEMPRESS. Take control of your boating and fishing experience, take control of your body and upgrade to the ProBax by TEMPRESS. Water resistant and durable for prolonged use Sewn with UV and abrasion-resistant polyester thread and covered in 30oz marine gradevinyl to stand up to all the elements Eight embedded mounting inserts will fit most slider systems that have a 5" mounting system when paired with the Elite Mounting Plate (57005)*** Dimensions: 27"H x 24"W x 27.5"D Made in the USA *** If mounting to a standard swivel with 4 holes this seat requires a reinforcing plate. The Reinforcing plate can be purchased separately under part 57005