Cellulose nanomaterial-enhanced footwear cushioning for improved durability and thermal comfort

Overview

VERDE Biomaterials is developing a novel approach to athletic footwear cushioning by incorporating cellulose nano-microfibers (CNMF) into conventional EVA foam and other cushioning matrices. CNMF is a biodegradable, biobased material derived from agricultural and industrial waste, processed using VERDE's proprietary platform technology. The goal is to create high-performance cushioning that delivers superior durability, stability, thermal comfort, and moisture management while reducing weight and environmental impact compared to traditional foam-only designs.

The innovation addresses two key challenges in athletic footwear: material performance and sustainability. By leveraging the unique physical properties of CNMF, including high tensile strength, low air permeability, and strong crystalline domains, VERDE aims to reinforce foam composites in a way that extends product lifespan, improves wearer comfort, and reduces the overall carbon footprint of footwear manufacturing.

Technical specifications

Key features and benefits:

• Enhanced durability: CNMF networks act as crack propagation barriers within the foam matrix, significantly improving strength, modulus, and elongation without increasing weight
• Thermal insulation: Freeze-dried CNMF in aerogel form provides thermal insulation through its 3D nano-scale pore structure
• Moisture management: CNMF aerogels offer moisture absorptivity properties that improve wearer comfort during physical activity
• Lightweight performance: The additive reinforces cushioning without adding material mass, supporting lightweight footwear design
• Reduced material usage: CNMF as a reinforcing filler can reduce the total amount of foam required, lowering the carbon footprint of the finished product
• Biodegradable and biobased: Derived from renewable biomass feedstocks such as corn stover and sugarcane bagasse, offering a sustainable alternative to fossil-based additives

How it works:

CNMF is freeze-dried to form aerogels with a confirmed 3D pore structure. The aerogel is then powdered and mixed into EVA at varying loadings. The composite is processed using injection or compression molding techniques compatible with standard footwear manufacturing. The CNMF network distributes stress throughout the foam, preventing crack growth and enhancing mechanical performance. Simultaneously, the porous aerogel structure contributes thermal insulation and moisture absorption properties to the cushioning layer.

Technology readiness level

This technology is currently at the proof-of-concept stage. Planned validation activities include confirming the 3D pore structure of freeze-dried CNMF aerogels, verifying thermal stability of the aerogel within the EVA processing temperature range, fabricating cushioning prototypes via injection and compression molding, and conducting comprehensive testing for strength, thermal stability, air transfer, moisture management, and durability. The project is expected to reach validated prototype status within approximately 12 months. VERDE Biomaterials brings established expertise in scalable CNMF manufacturing, supported by funding from the U.S. Department of Energy and the National Science Foundation, and active collaborations with national laboratories.