Which form of hair is the softest and least pigmented?

Vellus hair is indeed the softest and least pigmented form of hair found on the human body. It is fine, short, and often unnoticeable, providing a light covering to the skin, especially in areas such as the face, arms, and torso. Since vellus hair has little to no melanin, it appears much lighter in color compared to other hair types, which are typically thicker and more pigmented.

In contrast, terminal hair is coarser, longer, and more pigmented, making it more noticeable, while lanugo is the fine, soft hair that covers a fetus in the womb, typically shedding before birth, and is not present in adults. Coarse hair also refers to thicker, more robust hair strands that can have significant pigmentation. Thus, vellus hair stands out as the softest and least pigmented option among the choices.