Abstract: An improved adjustable seat having a supporting frame, a seat bucket type removable seat, and a connect-disconnect member disconnectably attaching the removable seat to the frame. The seat bucket and frame are provided with slides which permit relative change in attitude between the seat bucket and the frame in response to manipulation of seat reclining controls by the seat occupant. Included in the base frame are legs which are deformable under high acceleration-deceleration forces to absorb a portion of the energy resulting from the application of such excessive forces.