15 Types of Soles You Need to Know About

GL(Genuine Leather)

Genuine leather usually refers to animal hide that has been tanned. It’s most commonly used for dress shoes, high-end casual shoes, and leather boots.

Features

Natural Texture: The natural grain and texture of animal hide give it a premium appearance.

Breathability: The microscopic pores in animal leather provide excellent breathability, helping to keep your feet dry.

Durability: Tanned leather has a long lifespan and is more resistant to wear and tear.

Drawbacks

Genuine leather is expensive and requires regular cleaning. It is not suitable for damp environments.

PU

PU is a synthetic polymer material known as polyurethane. It is highly durable and resistant to wear, making it a popular choice for work shoes and boots.

Features

High Abrasion Resistance: PU has a hard surface and stable molecular structure, making it highly resistant to wear.

Good Waterproofing: The dense surface of PU material allows it to work for extended periods and is commonly used as a primary material in most outdoor gear.

Drawbacks

Higher Cost: Due to the complex manufacturing process, the production of PU requires more labor and resources, making it more expensive.
Limited Breathability: Although PU can be used for extended periods, its breathability is limited, leading to decreased comfort during prolonged use.

PVC

It is a polymer material obtained through the addition polymerization of vinyl chloride, commonly known as plastic soles. It is often used in rain boots, work shoes, and inexpensive fashion shoes.

Features

• Low cost, suitable for mass production
• Strong waterproof performance
• Wear-resistant and corrosion-resistant

Drawbacks

• Poor slip resistance, posing safety risks in high-friction environments
• Poor breathability, not suitable for long-term wear in high-temperature environments
• High hardness, limited shock absorption for the feet
• Low-temperature embrittlement, becoming brittle and hard in cold environments, affecting comfort

AL(Artificial Leather)

Artificial leather is made by synthesizing PVC (polyvinyl chloride) and PU (polyurethane) to mimic natural leather. It is flexible and can be embossed with various textures. Commonly used in fashion shoes, sneakers, children’s shoes, and budget-friendly casual shoes.

Features

Cost-effective: Cheaper than natural leather, ideal for mass production.

Variety: PVC and PU can be treated to produce different colors and textures, catering to diverse design needs.

Water-resistant: Easy to clean and maintain due to good water resistance.

Drawbacks

Breathability: Less breathable than natural leather and feels harder.

Durability: Not as durable as genuine leather.

Rubber

Rubber is a polymer material, categorized into natural rubber (NR) and synthetic rubber (SR). Natural rubber comes from latex of rubber trees, while synthetic rubber is chemically made, like styrene-butadiene rubber (SBR), neoprene(CR), and nitrile rubber (NBR). It’s known for its excellent elasticity and durability, used in sports shoes, hiking boots, work shoes, slippers, and rain boots.

Features

Durability: High molecular weight and cross-linked structure make it strong and wear-resistant.

Chemical Resistance: Good resistance to many chemicals, especially synthetic rubber, which excels in oil and solvent resistance.

Drawbacks

Although rubber is excellent in durability, it has poor breathability and is relatively heavy. It can harden in cold environments.

EVA

EVA, short for ethylene-vinyl acetate copolymer, has cushioning properties and is now commonly used in sports shoes, sandals, slippers, and outdoor footwear.

Features

EVA is lightweight, highly elastic, soft, and easy to process. As a main material for sports shoe soles, EVA meets most of the needs for sports shoes, including shock absorption, rebound, and comfort.

Drawbacks

EVA is not very wear-resistant, and long-term use can lead to wear and cannot be repaired. It also has poor heat resistance and lacks sufficient arch support.

MD

MD is a high-grade, lightweight material made by modifying the density of EVA through secondary foaming. To meet different needs, it is usually mixed with other materials. For example, EVA + RB (rubber) can enhance the wear resistance and slip resistance of the sole, while EVA + TPU (thermoplastic polyurethane) or PU (polyurethane) is used to increase shock absorption.

Its good lightweight and slip resistance are usually used in casual shoes, sports shoes, children’s shoes, and work shoes.

Features

Lightweight: Secondary foaming makes EVA lighter, which helps reduce the weight of the shoe.

Shock Absorption: MD material has excellent shock absorption performance, effectively absorbing and dispersing pressure when walking or running, protecting the feet and joints.

Softness: MD material is softer and more comfortable than other materials, and it is suitable for various occasions.

Drawbacks

This type of material is relatively soft and has poorer support compared to harder materials. It may not be suitable for high-support needs like hiking boots and sports shoes. It also has poor heat resistance, which can lead to aging and affect shoe performance due to high temperatures.

Additionally, the manufacturing cost of MD material is higher compared to ordinary EVA material, increasing the overall cost of the shoe.

TPR

TPR is made by mixing rubber and plastic in a certain proportion and then adding plasticizers, stabilizers, fillers, and other auxiliary materials for melting. It not only has the characteristics of natural rubber but, unlike rubber, TPR material can be remelted and reprocessed, making it highly recyclable. It is commonly used in running shoes, casual shoes, and work shoes.

Features

Weather Resistance: TPR has better temperature resistance than natural rubber, maintaining performance under extreme temperatures and strong UV exposure.

Odor: TPR has a lighter odor than rubber, suitable for products with low odor requirements.

Durability: Inherits the wear resistance of rubber, maintaining shape and function in high-friction environments.

Drawbacks

Although TPR shows sufficient chemical resistance in general chemical environments, it is not as good as rubber in some chemical environments. Also, due to process reasons, TPR requires high equipment standards, increasing manufacturing costs.

TPU

TPU is a polymer made by reacting diisocyanates with polyether or polyester polyols. It has high elasticity and flexibility, commonly used in sports shoes, casual shoes, and work shoes.

Features

Durability: Inherits the wear resistance of rubber, maintaining shape and function in high-friction environments.

Elasticity: TPU has high elasticity and toughness, quickly returning to shape after stretching.

Drawbacks

TPU is more expensive and has a more complex process compared to other materials.

TR

TR is made by adding plastic components to rubber, giving it both the elasticity of rubber and the moldability of plastic. It is commonly used in sports shoes, casual shoes, and children’s shoes.

Features

Ease of Processing: TR has good moldability, can be produced efficiently through injection molding, and is cost-effective.

Shock Absorption: Inherits the elasticity of rubber, providing good shock absorption.

Durability: TR has better wear resistance than ordinary rubber soles, suitable for use in friction environments.

Drawbacks

TR material doesn’t handle temperatures well. It can deform in high heat and harden in the cold. Plus, it doesn’t stand up well to strong acids or alkalis, making it unsuitable for extreme temperatures or environments with grease, strong acids, or bases.

BPU

BPU is a bio-based polyurethane material similar to traditional polyurethane but partially sourced from renewable resources, reducing emissions and environmental pollution.

It meets international environmental standards and can replace EVA soles, PVC foam soles, etc., commonly used in sports shoes, slippers, and casual shoes.

Features

Eco-friendly: BPU uses bio-based materials to reduce dependence on petroleum-based materials, lowering carbon emissions and environmental pollution.

Compliance: As global environmental regulations become stricter, using BPU material can better meet relevant regulatory requirements.

Lightweight: BPU is lightweight overall and uses foaming technology, reducing the overall weight of the shoe.

Drawbacks

Due to the high requirements for selecting and proportioning color masterbatches in the dyeing process, BPU’s color stability and uniformity are hard to control. This can limit designers’ freedom in color choices.

Although BPU is more environmentally friendly compared to EVA, it is also relatively more expensive.

TEB(Thermoplastic Elastomer Bottom)

TEB is typically made by mixing different thermoplastic elastomers in a specific proportion under high temperature and pressure.

TEB combines the advantages of multiple thermoplastic elastomers, featuring good elasticity, strong wear resistance, and ease of processing. It is commonly used in sports shoes, casual shoes, work shoes, and children’s shoes.

Features

Quiet: TEB material has a micro-porous structure that can absorb sound waves, providing some sound insulation.

Low-Temperature Performance: TEB maintains good elasticity and toughness in low-temperature environments, not easily hardening.

Comprehensive: TEB combines the advantages of different thermoplastic elastomers, offering comprehensive benefits such as wear resistance, elasticity, chemical resistance, and processability.

Drawbacks

TEB is more expensive due to the combination of multiple high-performance polymers and complex processing, requiring high-precision equipment and intricate processes, increasing processing costs. 

Additionally, although TEB has good low-temperature performance, its heat resistance is average, similar to EVA and natural rubber, prone to deformation and aging under prolonged high temperatures.

PC(Plantation Crepe)

PC, short for polycarbonate, is a high-strength, impact-resistant thermoplastic commonly used in safety shoes and outdoor footwear.

Features

Strength: Capable of withstanding strong impacts.

Heat Resistance: Remains stable and does not deform at high temperatures.

Drawbacks

Hardness: Less comfortable in certain areas of the sole.

Cost: High cost, not suitable for mass production.

Low-Temperature Brittleness: Can become brittle and crack in cold environments.

Composite Soles

Composite soles are made by combining the advantages of multiple materials, such as TPU, PU, and EVA, tailored to specific needs. They are often used in sports shoes, hiking boots, and work shoes.

Features

Versatility: Combines the advantages of multiple products, providing comprehensive performance such as arch support, shock absorption, wear resistance, and slip resistance.

Customization: Performance can be varied according to specific needs, achieving the best performance in particular environments.

Drawbacks

Difficult and costly to manufacture, with high processing costs due to the need for customization. Additionally, different customization needs make these products difficult to recycle.

Silicone Soles

Silicone soles are made from polydimethylsiloxane (PDMS), a high-performance material commonly used in sports shoes, indoor shoes, and slippers.

Features

High elasticity, slip-resistant, heat-resistant, insulating, eco-friendly

Drawbacks

Complex manufacturing process leading to high cost, poor breathability

Conclusion

If you want your brand to stay competitive, improving the performance and quality of your shoes are direct factors. Therefore, choosing the right sole material for your shoes is also crucial.

This article introduces the common types of sole materials on the market and their characteristics, hoping to provide you with a better understanding of shoes.