Lateral Toe Seam Sock Structure for Reduced Big Toe Chafing

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Solution Overview

Problem

Traditional socks with toe seams extending from the medial to lateral side can cause discomfort and chafing, particularly on the big toe area, especially during activities requiring frequent foot-to-surface contact.

Innovation Solution

The toe seam is primarily located on the lateral side of the sock, with a foot locating feature on the medial side to enhance comfort and prevent pressure points, and the sock may include an open toe and heel design for increased surface contact with the exercise surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the toe seam extends from the medial side to the lateral side of the sock, then the sock structure is simple and easy to manufacture, but it causes discomfort and chafing on the big toe area

Engineering Contradiction:

Improvesock manufacturing simplicityVSAvoidseam-induced discomfort and chafing

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The toe seam is repositioned from its traditional medial-side location to the lateral side of the sock. This inversion of the seam placement eliminates direct contact with the big toe area, preventing chafing and discomfort while maintaining the structural integrity and manufacturing simplicity of the sock through alternative construction methods

Inventive Principle:

Principle #13The other way round (Inversion)

2Object-affected harmful factors

If the toe seam is located on the lateral side of the sock, then wearer comfort is improved by eliminating pressure points on the big toe, but the sock structure becomes more complex

Engineering Contradiction:

Improveseam-induced pressure pointsVSAvoidsock structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The toe seam is divided into multiple segments: a first segment extending from the dorsal surface toward the plantar surface on the lateral side, and a second segment extending from the first segment to close the tubular structure. This segmentation allows the seam to achieve the lateral-side placement for comfort while distributing the structural closing function across multiple manageable sections that can be manufactured using standard techniques

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If traditional toe seam construction is used, then the sock is easy to manufacture, but it creates pressure points that reduce wearer comfort during activities

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidwearer comfort during activity

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The toe seam placement is inverted from the traditional medial-side position to the lateral side of the sock. This repositioning eliminates direct contact with the big toe area, preventing chafing and discomfort during activities while the segmented construction maintains manufacturing feasibility through adapted sewing or knitting processes

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentEP3902420B1Sock with lateral toe seam

Publication Date: 2026.01.28 NIKE INNOVATE CV

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AI summary

Concepts provided are directed to a sock (100) having a toe seam (124) that is primarily located on a lateral side of the sock. The sock may comprise a foot locating feature (120) to ensure that the wearer dons a right footed sock on a right foot and a left footed sock on a left foot so that the toe seam is localized to the lateral side of the wearer's foot when the sock is worn by the wearer.