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This is due to wool characteristics that also serve to make it the most unique, completely natural and multipurpose fiber available.1  Sheep wool has the capability to keep the body at at even temperature because it does not trap heat, it insulates instead. Felting is the nature of most animal fur that allows it to entangle and form mats of fabric. 2  The fibers (strands) can interlock with each other due to ridges on the individual fibers. 3  Sheep wool is highly regarded for its ability to felt and form fabrics that are near impossible to tear.
Wool Characteristics. When you are learning to tell one wool from another, consider its crimp, fiber length, and fiber diameter, and look at the types and mix of fibers in the fleece. Crimp. Crimp, which consists of the natural kinks or waves in individual fibers, forms as those fibers grow; it is permanent.ool, Hair and Kemp. The term wool can apply to an entire fleece, but it also refers to a specific type of fiber within a fleece. Wool fibers are relatively fine, and have crimp and elasticity; even coarse wool fibers are much finer than hair fibers. Hair fibers are straighter, smooth, strong, and inelastic.