Wool, poly, and nylon blended yarn or fabric is a textile material that combines three different types of fibers: wool, polyester (poly), and nylon. Each of these fibers has its own unique properties, and blending them together can result in a fabric with a combination of these characteristics. Here's an overview of each fiber and the benefits of blending them:

1. Wool:
- Wool is a natural fiber obtained from the fleece of sheep or other animals like goats (cashmere and mohair) and rabbits (angora).
- It is known for its warmth, softness, and excellent insulating properties, making it ideal for cold weather garments.
- Wool also has moisture-wicking properties, which help regulate body temperature by absorbing and releasing moisture.

2. Polyester (Poly):
- Polyester is a synthetic fiber made from petrochemicals.
- It is known for its durability, resistance to wrinkles and shrinking, and quick drying.
- Polyester fabrics are often used in blends to add strength and longevity to the material.

3. Nylon:
- Nylon is another synthetic fiber, initially developed as a substitute for silk.
- It is known for its strength, abrasion resistance, and elasticity.
- Nylon is often used in blends to enhance the fabric's durability and stretchiness.

Blending these fibers together can result in a fabric that combines the natural warmth and moisture-wicking properties of wool with the durability and quick-drying features of polyester and the strength and stretch of nylon. This combination can result in a fabric that is soft, warm, durable, and relatively easy to care for, making it suitable for a variety of applications, including clothing, blankets, and outerwear.

The specific proportions of each fiber in the blend can vary, and the resulting fabric's characteristics will depend on the ratio used. Blending these fibers allows textile manufacturers to create fabrics that balance the best qualities of each fiber for particular uses and preferences.