Which of the following are considered natural fibers most commonly worked with by designers?

Wool and cotton are considered natural fibers because they are derived from natural sources. Wool comes from the fleece of sheep, while cotton is harvested from the fluffy seed fibers of the cotton plant. These fibers have unique characteristics that make them popular in residential interior design.

Wool is known for its durability, warmth, and ability to repel water, making it an excellent choice for textiles and upholstery. Cotton is appreciated for its softness, breathability, and versatility, making it suitable for a wide range of applications, from curtains to cushion covers.

In contrast, the other options consist of synthetic fibers or blends. Polyester, rayon, nylon, acrylic, and spandex are all man-made fibers, which do not have the same natural properties as wool and cotton. Understanding the distinction between natural and synthetic fibers is crucial for designers when selecting materials for various projects, as it affects texture, sustainability, and maintenance.