Disclosed is a lightweight seat (100) that includes a seat base (102), a seat bottom (103) attached to an upper portion of the seat base, a seat back (101) attached to a rear portion of the seat bottom, and a seat belt assembly (150) secured to the seat bottom. The seat belt assembly may include a strap (104) attached to an underside of the seat bottom and extending from a first end adjacent to first side of the seat bottom to a second end adjacent to a second side of the seat bottom and a seat belt disposed adjacent to an upper side of the seat bottom, wherein a first end of the seat belt is attached to the first end of the strap and a second end of the seat belt is attached to the second end of the strap.

An armrest includes an armrest arm having an upper support surface forming a support for the forearm of an occupant of the vehicle seat, and a user interface having at least one display portion of flattened shape, having a front face comprising a screen and a rear face formed by a shell. The user interface is mounted on the armrest arm so as to be movable between a retracted position where the screen is inaccessible and an extended position where the screen is accessible. In the retracted position of the user interface, the shell is integrated with the upper support surface of the armrest arm, and in the extended position of the user interface, the screen is at least partially projecting above the upper support surface of the armrest arm.

Disclosed is a lightweight seat (100) that includes a seat base (102), a seat bottom (103) attached to an upper portion of the seat base, a seat back (101) attached to a rear portion of the seat bottom, and a seat belt assembly (150) secured to the seat bottom. The seat belt assembly may include a strap (104) attached to an underside of the seat bottom and extending from a first end adjacent to first side of the seat bottom to a second end adjacent to a second side of the seat bottom and a seat belt disposed adjacent to an upper side of the seat bottom, wherein a first end of the seat belt is attached to the first end of the strap and a second end of the seat belt is attached to the second end of the strap.

The present invention in one or more embodiments provides a seat assembly of a vehicle, including a seat base, a seat back communicating with the seat base, an armrest communicating with at least one of the seat back and the seat base, and a pretension unit connected to the armrest such that the armrest is retractable upon activation of the pretension unit. The pretension unit may include a pretensioner, a pulley, and a cable.