X1 Series | Reset your expectations Professionals who expect the very best from their technology turn to the ThinkPad X1 line-not just for innovation and style, but for uncompromised performance. From ultralight laptops and 2-in-1s, to extreme power machines, to the world's first foldable PC, X1s raise the bar. And with ThinkPad in their name, reliability and security are de rigueur.