Answer (Abbreviated, Ready for Use)
Mesh fabrics differ in material, structure, elasticity, breathability, weight, and application:
Material
Polyester: Strong, durable, cost-effective.
Nylon: Soft, elastic, wear-resistant.
Structure
Single-layer: Light, breathable, for casual shoes.
3D sandwich: Thick, resilient, for uppers/insoles.
Flyknit/knitted: Elastic, lightweight, for sports shoes.
Elasticity
High elastic: Stretchy, holds shape.
Normal: Stable, for support.
Breathability
Large-hole: Best ventilation.
Dense: Better support.
Application
Lightweight: Running, casual shoes.
Elastic knit: Sports, sneakers.
Thick sandwich: Work, hiking shoes.
In summary, mesh fabrics cater to different needs for comfort, support, breathability, and appearance.