Wool

Definition and Overview

Wool is a natural animal fiber made by spinning sheep’s wool. Its scaly fiber surface and crimp make it easy to trap air, and for apparel, its look and performance vary greatly depending on yarn thickness, fiber length, spinning method, and weave or knit structure.

When the fabric label says “wool,” it generally refers to wool. However, animal hair fibers also include cashmere and mohair, and these are fibers obtained from animals other than sheep, so they are sometimes handled separately from wool.

Characteristics

Wool traps air between its fibers, giving it excellent warmth retention. It also readily absorbs and releases moisture, making it less likely to feel clammy. It has elasticity and tends to recover from wrinkles easily, but the results vary depending on material design and finishing.

The surface ranges from smooth worsted styles to bulky woolen styles and soft fuzzy finishes. On the other hand, fuzzing, pilling, shrinkage, and felting can occur due to friction, or when wet, so it is important to choose the appropriate blend and processing for the intended applications.

• Warmth retention: It traps air easily and is used in materials for fall and winter.
• Moisture absorption and release: It helps regulate moisture inside garments.
• Elasticity: It has recovery and is also used for three-dimensional silhouettes.
• Flame resistance: It is not easily melted, but product performance should be checked including blend ratio and processing.

Main Applications

In addition to woven products such as suits, jackets, coats, pants, skirts, and dresses, it is also used in knit products such as sweaters, cardigans, and cut-and-sew items. Those designed with a light yarn and structure are also used for spring and summer clothing.

Heavy, fuzzy fabrics are suitable for coats and cold-weather clothing, while supple fabrics with a neat surface are suitable for suits and formal wear. It is also used for fashion accessories and interior applications such as scarves, hats, gloves, and blankets, where warmth retention and a soft feel are valued.

How to Choose and Points to Note

When selecting, check not only the blend ratio but also the industry weight, thickness, density, weave or knit structure, and whether it is fuzzy. Even with the same wool, fabrics made with worsted yarn tend to have a relatively crisp look, while fabrics made with woolen yarn tend to have a fuller, warmer look.

Always follow the product’s care label for washing and ironing. Because shrinkage and changes in texture may occur with water washing, it is important to conduct testing or sample washing in advance. For sewing, with fabrics that stretch easily or are thick, consider the sewing conditions including interfacing and seam allowance specifications.

• Because shrinkage rates can vary depending on lot and finishing, check before cutting.
• For areas prone to friction, evaluate pilling and fuzzing.
• Use a pressing cloth when ironing, and avoid shine or marks caused by pressing too hard.
• Even if shrink-resistant processing has been applied, confirm the label because changes can still occur depending on washing conditions.

Differences from Similar Terms

Cashmere, mohair, and alpaca are animal hair fibers collected from animals other than sheep. In a broad sense, they may also be called wool, but in apparel material labeling and fabric selection, they are handled separately because the source animal and fiber characteristics differ.

Tweed, flannel, and melton are fabric names that are often made mainly from wool. Wool, on the other hand, is the name of the raw material fiber. Also, wool blends mixed with polyester and other fibers are used to supplement durability and ease of handling.

Frequently Asked Questions

Is wool only a winter material?

Wool is noted for its warmth retention, but fabrics made with fine yarn and designed with a thin, breathable structure are also used for spring and summer clothing. Seasonal suitability is judged not only by the material, but also by the industry weight, structure, finishing, and whether there is a lining.

Should I choose 100% wool or a wool blend?

Choose based on the desired texture, washing method, durability, cost, and intended applications. 100% wool makes it easier to take advantage of the material’s natural fullness and moisture absorption and release, while blended products may be adjusted for strength, lightness, stretch, and ease of care.

Why does wool fabric shrink?

Wool can become entangled under the influence of moisture, heat, and friction, causing felting and shrinkage. Regardless of whether shrink-resistant processing has been applied, follow the washing conditions appropriate for the product label, and before mass production, check dimensional changes with a washing test.