Leather is composed of multiple layers of material, each with a unique function that affects the overall properties of the leather. The following are the main components of leather and the detailed functions of each layer:

1. Grain Layer : This is the outermost layer of leather, mainly composed of protein fibers, with a fine texture and gloss. It gives leather its unique texture and aesthetic appeal.

2. Network Layer : Located beneath the grain layer, it is formed by tightly interwoven fiber bundles, creating a network structure. This layer provides the leather with strength and toughness, making it durable and resistant to damage.

3. Organizational Layer : This is the main support layer of leather, composed of protein fibers and fat. It not only provides the leather with elasticity and softness, but also contributes to the leather's warmth and breathability.

4. Muscle Layer : Located innermost, it is mainly composed of muscle fibers and fat. This layer provides the leather with sufficient elasticity, allowing it to adapt to different usage needs.

In addition, leather also contains a certain amount of minerals and other substances, which play an indispensable role in the stability and durability of the leather.
Physical and Chemical Properties of Leather:
Leather is not only unique in its structure, but also exhibits a variety of physical and chemical properties. These properties make leather excellent in practicality and durability, making it an ideal choice for the production of many products. The following are some of the key properties of leather:

1. Elasticity : Leather has excellent elasticity and can adapt to various shapes and pressures. This allows leather products to maintain their original shape during use and are not easily deformed.

2. Softness : Leather has moderate softness, ensuring both comfort of use and structural stability. This softness allows leather products to conform to body curves when worn or used, providing a comfortable wearing experience.

3. Abrasion Resistance : After special treatment, leather has high abrasion resistance. This makes leather products durable, resistant to wear, and extends their service life.

4. Weather Resistance : Leather is well adapted to various climatic conditions. Whether it is high temperature, low temperature or humid environment, leather can maintain its original performance and appearance and is not easily damaged.

In addition, leather also has good breathability and moisture absorption, which further enhances its wearing comfort and practicality.