Application of Microfiber Synthetic Leather in Shoe Uppers

Application of Microfiber Synthetic Leather in Shoe Uppers

Materials used for sports shoe uppers primarily include leather, mesh, and textiles. Among leather materials, natural leather offers advantages in flex resistance, tensile strength, and breathability; however, due to its poor washability and high cost, its use in sports shoes is limited. Artificial leathers come in various types, generally categorized into artificial leather, synthetic leather, and microfiber synthetic leather.

Microfiber synthetic leather (often referred to simply as microfiber leather) is a high-performance synthetic material. It utilizes an "island-in-the-sea" fiber non-woven fabric as a base. This base is impregnated with polyurethane slurry and subjected to wet coagulation to form an island-in-the-sea fiber/polyurethane composite. Subsequently, a fiber-opening process (such as dissolution, alkali reduction, or toluene reduction) is applied to convert the island-in-the-sea fibers into ultrafine fibers, resulting in the final microfiber/polyurethane composite-the base fabric for microfiber synthetic leather.

Microfiber leather is lightweight, eco-friendly, and possesses superior physical properties, making it an ideal substitute for natural leather. Enhancing its anti-wicking capabilities, breathability, and softness can further expand its application in sports shoes and other footwear.

Performance advantages of microfiber leather:

• Lightweight and mechanical properties: Microfiber leather typically has a specific gravity of 0.3–0.5-significantly lower than that of natural leather (0.6)-which helps reduce the weight of the shoe upper. Additionally, it exhibits excellent mechanical properties, with tensile and tear strengths reaching up to three times those of natural cowhide.

• Weather resistance: It demonstrates outstanding aging resistance, maintaining stable physical properties in both high and low-temperature environments, and is resistant to fading or becoming brittle due to UV exposure.

• High fidelity: Its appearance and tactile feel closely resemble those of natural leather, offering a high degree of authenticity.

• Good breathability: It offers good air and water-vapor permeability, although its overall hygienic performance is slightly inferior to that of natural leather.

• Environmental Sustainability: The production process for microfiber leather is non-toxic, energy-efficient, and low-carbon. During use, it features low VOC emissions, high durability, and requires no chemical maintenance. Furthermore, it boasts an exceptionally high recycling rate (over 95%), aligning with the principles of full-lifecycle sustainability.

As an innovative, eco-friendly material, microfiber leather is increasingly favored by the market and has become one of the most common materials for sports shoe uppers.