An upholstery is described. The upholstery includes a dress cover (204) which covers a cushion (202). Artificial muscles are incorporated into the dress cover (204). The artificial muscles improve the pressure distribution between a passenger and the cushi...

A seat cushion device capable of adjusting hardness of a seat cushion including a seating surface, on which a user is seated, includes a recessed part that is formed in a back surface of the seating surface in the seat cushion, a left plate that faces a ba...