HT figured it out at last.
HT still uses rubber, just not solid rubber outside of the female arms. Their new muscle bodies use a thin layer of rubber from the pecs up and over the neck. EB's T-800 is the same way. Not sure what Rambo is, if there's no articulation in his torso, I would think it's more PVC than rubber, that way they can get the level of paint detail they've got there.