A 2D quantum superfluid would feel very strange to the touch. It would feel like a smooth, Frictionless surface, as the superfluid would flow without any resistance. It would also feel very cold, as the superfluid would be at a temperature close to absolute zero. Additionally, the superfluid would feel very light, as it would have a very low density.

Overall, a 2D quantum superfluid would be a very interesting and unique material to the touch. It would provide a very different experience from anything else that we are used to feeling in our everyday lives.