Which of the following is NOT a characteristic of wool?

Wool is known for several key characteristics, including warmth, durability, and, in some instances, scratchiness depending on the type or quality of the wool. Its inherent properties make it an excellent insulator, which contributes to its warmth, and it is also quite durable, standing up well to wear and tear.

However, when considering lightness, wool is typically heavier than many other fabrics, particularly synthetic options and lighter natural fibers like cotton or linen. Wool’s density often provides a bulkier feel, which can be perceived as heavier, making it less suited for contexts where lightweight fabrics are desired. Therefore, identifying lightness as a characteristic of wool would be inaccurate, leading to the conclusion that it is the correct choice as the one that does not belong in the context of wool's characteristics.