Short answer
When designing footwear for cold conditions, focus on maximizing the thickness of insulating materials rather than adding weight, and be mindful of how thermal performance is measured.
- Field
- Human Factors
- Source
- Fashion and Textiles (2025)
- Method
- Experimental
- Sample
- 11 boots (3 Korean military, 4 US military, 4 occupational)
- Evidence
- Strong effect
The thermal insulation of footwear in cold conditions is significantly more dependent on the material's thickness than its mass. This human factors research insight is drawn from a 2025 study published in Fashion and Textiles. Using Experimental with 11 boots (3 Korean military, 4 US military, 4 occupational), researchers explored how this design variable affects real-world outcomes. The key design takeaway: When designing footwear for cold conditions, focus on maximizing the thickness of insulating materials rather than adding weight, and be mindful of how thermal performance is measured.
Boot insulation is primarily determined by thickness, not weight, in cold environments.
The thermal insulation of footwear in cold conditions is significantly more dependent on the material's thickness than its mass.
Fashion and Textiles · 2025
Key Findings
- 01Total thermal insulation (I_T) of the tested boots ranged from 0.9 to 1.2 clo per boot.
- 02No significant differences in thermal insulation were found across the three tested air temperatures.
- 03Thermal insulation showed a strong positive correlation with boot layer thickness (r = 0.905).
- 04There was no significant relationship between thermal insulation and boot mass.
- 05Boot layer thickness alone explained 81% of the variance in thermal insulation, and thickness combined with mass explained 94%.
Application
Design takeaway
When designing footwear for cold conditions, focus on maximizing the thickness of insulating materials rather than adding weight, and be mindful of how thermal performance is measured.
How to apply
When selecting materials or designing the structure of winter boots, prioritize thicker insulating layers. When evaluating prototypes, use a measurement method that accounts for the specific areas covered by the boot.
Project actions
- 01When testing footwear, ensure consistent environmental conditions.
- 02Consider how different measurement zones on a manikin might affect your results.
Method & Evidence
Variables
Strengths & Limitations
Strengths
- +Uses a standardized thermal manikin for objective measurement.
- +Compares different calculation methods for thermal insulation.
Limitations
The study's findings might not directly apply to footwear designed for extreme cold or high-activity scenarios where heat generation is significant.
Reliability & validity
The use of a thermal manikin and controlled environmental conditions enhances the reliability and internal validity of the findings regarding the relationship between thickness and insulation. However, external validity may be limited by the specific boot types and conditions tested.
Think critically
How might the relationship between thickness, mass, and insulation change if the footwear is designed for high-intensity activities versus static wear in the cold?
Design Principles
"For thermal insulation in footwear, thickness is a more significant design parameter than mass."
This insight is crucial for designers developing protective footwear for cold climates. Focusing on material thickness allows for optimized thermal performance without unnecessarily increasing weight, which can impact user comfort and mobility.
What This Means for Your Design
If you want to make boots warmer for cold weather, make them thicker, not heavier. How you measure the warmth matters too.
How to use in your project
- 1.Reference this study when justifying design choices related to material selection for thermal insulation in footwear.
- 2.Use the findings to inform the development of a testing methodology for your own design project.
Add to My Project
Quick Cite
Paragraph starter
Research indicates that the thermal insulation of footwear in cold environments is predominantly influenced by material thickness rather than mass. A study by Lee et al. (2025) found a strong correlation between boot layer thickness and thermal insulation, with thickness alone explaining 81% of the variance. This suggests that design efforts should prioritize the use of thicker insulating materials to enhance thermal performance, rather than focusing on reducing weight.
Source
Fashion and Textiles
Thermal insulation of military boots using a thermal foot manikin in cold environments
journal · 2025
View sourceQuestions About This Research
- What does the research say about boot insulation is primarily determined by thickness, not weight, in cold environments?
- When designing footwear for cold conditions, focus on maximizing the thickness of insulating materials rather than adding weight, and be mindful of how thermal performance is measured. Evidence: Fashion and Textiles (2025).
- Why does "Boot insulation is primarily determined by thickness, not weight, in cold environments." matter for design?
- This insight is crucial for designers developing protective footwear for cold climates. Focusing on material thickness allows for optimized thermal performance without unnecessarily increasing weight, which can impact user comfort and mobility.
- How can designers apply this research?
- When designing footwear for cold conditions, focus on maximizing the thickness of insulating materials rather than adding weight, and be mindful of how thermal performance is measured.
- What were the main findings?
- Total thermal insulation (I_T) of the tested boots ranged from 0.9 to 1.2 clo per boot.. No significant differences in thermal insulation were found across the three tested air temperatures.. Thermal insulation showed a strong positive correlation with boot layer thickness (r = 0.905).. There was no significant relationship between thermal insulation and boot mass.
- What research method was used?
- Experimental with 11 boots (3 Korean military, 4 US military, 4 occupational).
- How strong is the evidence?
- Evidence strength is rated Strong effect, based on a 2025 journal from Fashion and Textiles.
- What should I do differently in my next project?
- When selecting materials or designing the structure of winter boots, prioritize thicker insulating layers. When evaluating prototypes, use a measurement method that accounts for the specific areas covered by the boot.
- What are the limitations?
- The study used a limited range of boot types and did not explore extreme cold temperatures or varying airflow conditions. The manikin-based measurement might not perfectly replicate real-world human foot thermal regulation.