The Sierra Torsion 380 combines our heavy duty, mechanical suspension with our ergonomic upper seat to provide you with the ultimate in driver comfort. The unique, low profile, torsion bar suspension provides 4 inches of shock absorbing ride. The weight adjustment allows the same level ride regardless of the operator's weight with adjustment from 110 to 275 pounds. The addition of our independent 3" Height Adjust allows you to adjust the seat height from 17" to 20" (430 mm to 500 mm) with a simple lever movement. High or low back available with optional back recline and armrest.