Development of a Footwear Sizing System in the National Football League

NewsBot · Jul 29, 2018

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Development of a Footwear Sizing System in the National Football League.
Wannop JW et al
Sports Health. 2018 Jul 26:1941738118789402.

CONTEXT:
Footwear performance and injury mitigation may be compromised if the footwear is not properly sized for an athlete. Additionally, poor fit may result in discomfort and foot injury such as fifth metatarsal stress fracture, foot deformities, turf toe, and blisters. Current footwear fitting methods consist of foot length and width measurements, which may not properly describe the shape of the individual foot, correlated with shoe size descriptors that are not standardized. Footwear manufacturers employ a range of sizing rubrics, which introduces shoe size and shape variability between and even within footwear companies. This article describes the synthesis of literature to inform the development and deployment of an objective footwear fitting system in the National Football League (NFL). The process may inform athletic footwear fitting at other levels of play and in other sports.

EVIDENCE ACQUISITION:
Literature related to footwear fitting, sizing, and foot scanning from 1980 through 2017 was compiled using electronic databases. Reference lists of articles were examined for additional relevant studies. Sixty-five sources are included in this descriptive review.

STUDY TYPE:
Descriptive review.

LEVEL OF EVIDENCE:
Level 5.

RESULTS:
Current methods of footwear fitting and variability in the size and shape of athletic footwear complicate proper fitting of footwear to athletes. An objective measurement and recommendation system that can match the 3-dimensional shape of an athlete's foot to the internal shape of available shoe models can provide important guidance for footwear selection. One such system has been deployed in the NFL.

CONCLUSION:
An objective footwear fitting system based on 3-dimensional shape matching of feet and shoes can facilitate the selection of footwear that properly fits an athlete's foot.
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NewsBot · Oct 5, 2019

Developing elderly men’s footwear sizing system based on their foot shapes
Namsoon KimWolhee Do
Fashion and Textiles December 2019

The purpose of this study was to develop a shoe sizing system for elderly men in Korea based on previous studies which analyzed aspects and shapes of the sole of those who aged 60 years or more. The sizing system creation process included natural log-transformation, principle component analysis, multivariate linear regression, size range determination, and measurements calculation. Measurement interval was set up based on Korea standard (KS). Cross analysis was conducted for basic items to select an interval which indicated frequency of more than 5% by type. A measurement system was then established by type. As results of this study, a shoe sizing system was developed with an interval of 5 mm for foot length, an interval of 3 mm for the circumference of the top of the foot, and an interval of 6 mm for the circumference of the top of the foot within the same foot length standard. To reflect characteristics by type, respective shoe sizing systems in accordance with type were developed. 12 types of shoe sizing systems were suggested for elderly men. Our results indicate that shoe sizing system for elderly men by foot type could improve the suitability of shoes. They could give wider range of shoe sizes and high satisfaction. They can help shoe makers produce shoes with various purposes and functions for seniors.
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