"Oceansouth Waverider boat seat pedestal acts as a shock absorber allowing you a smooth travel on rough seas and large waves. Waverider pedestal reduce the shock normally felt in your back and legs.Being Gas powered, allows easy adjustment of the seat height between 18"-28" to suit each individual.Aluminium Anodised shaft makes the pedestal resistant to corrosion and also ensures durability and strength. Powder coated aluminium base fade and corrosion resistant."