The assembly comprises a first part made of synthetic resin with integral connecting part on the outer surface of which are protuberances. A second part made of a second synthetic resin has an integrally moulded attachment part enclosing the outer surface of the connecting part. The first part is movable in relation to the second part. The two parts are enclosed in a third, elastic part made of a third synthetic resin. The movable body comprises a torso with integral hip joint part from the outer surface of which protrude protuberances. A lower leg has an integral knee joint part from the outer surface of which protrude protuberances. A thigh has an integral hip joint part and integral knee joint part.
