Airmesh or 3D sandwich mesh fabric is produced through a specialized knitting process that creates a three-dimensional structure. Here is a brief introduction to the production process:

1. **Yarn Selection**: High-quality polyester or nylon yarns are typically used due to their durability and flexibility.

2. **Knitting**: The yarns are fed into a warp knitting machine. This machine is specially designed to produce three-dimensional fabrics. Two layers of fabric are knitted simultaneously, with a spacer yarn connecting them to create the 3D structure.

3. **Spacer Yarn**: The spacer yarn is crucial in forming the thickness of the fabric. It provides the cushioning effect by creating space between the two outer layers. The thickness can be adjusted based on the intended use of the fabric.

4. **Heat Setting**: The knitted fabric undergoes a heat-setting process to stabilize its shape and structure. This involves passing the fabric through a heated chamber, which helps to lock in the fabric's dimensions and improve its durability.

5. **Finishing**: Additional finishing processes such as dyeing, coating, or laminating may be applied to enhance the fabric's appearance, performance, and functionality. This can include adding water-repellent or antimicrobial treatments.

6. **Quality Control**: The final fabric is inspected for any defects or inconsistencies. Quality control ensures that the fabric meets the required standards for its intended application.

This process results in a lightweight, breathable, and durable fabric with excellent cushioning and support properties, making it ideal for use in athletic shoes, upholstery, and other applications where comfort and ventilation are important.