- Open Access
A study on the design improvement of protective footwear for firefighters
© The Author(s) 2018
- Received: 7 July 2017
- Accepted: 2 March 2018
- Published: 22 August 2018
In this study, protective footwear for firefighters in Korea was evaluated. Based on the results of wearing evaluation, three types of new designs of firefighting protective footwear were developed: prototypes I, I and II. The prototypes with improved designs were evaluated by wear trails and design preference. Surveys on wearing and design preference of firefighting protective footwear, led to suggestions for designs elements of protective footwear. Firstly, the combination of laces and buckle was suggested for the closure. Secondly, the footwear material suggested was artificial leather with excellent waterproof and ventilation standards. In addition, retro-reflective and fluorescent materials and various colors were suggested for visibility. Thirdly, appearance designs were suggested in three categories: figure, line, and arrangement. Based on the design suggestions, prototypes with improved designs were made. An evaluation was conducted wearing the prototypes with improved designs. All prototypes were found to satisfy more than half of the design and wearing evaluation categories.
- Protective footwear
- Design improvement
- Evaluation upon wearing
According to KFIS 008 (Korea Fire Institute Standards (KFIS) 2001), protective footwear for firefighters must protect the human body from various dangerous elements including an extreme external environment, heat, fire, chemical substances, sharp objects, and shock. They must also maximize movement, and provide safety and comfort for firefighters who work in extreme conditions. The structure of protective footwear for firefighters consists of the main body, inner sole, protective sole, lining, shin guard, outer sole, and slip prevention grooves. There are two types footwear: rubber footwear and leather footwear. Rubber footwear uses vulcanized rubber on the outside, and aramid fiber for the lining, and has a pulling loop-type opening. Leather footwear has leather material on the outside, penetration prevention fabric on the inside, and a zipper-type opening. According to KFIS 008 (KFIS 2001), protective footwear for firefighters in Korea must be at least 30 cm high from the bottom of the outer sole. When the heel and soles are attached to the upper leather, no metal parts such as nails or screws can be used. The weight limitation for rubber footwear is 2.8 kg, and the limitation for leather footwear is 3.0 kg. The evaluation categories for protective footwear for firefighters include tension, electricity-resistance, water-resistance, heat-resistance, heat transmission, and internal heat conduction. The international and domestic standards for protective footwear for firefighters include NFPA 1971 (National Fire Protection Association (NFPA) 2013), CSN EN 15090 (Safety Protection Standards (CSN EN) 2012), and ISO 15538 (International Organization for Standardization (ISO) 2001).
Published studies on protective footwear for firefighters include a study on wear of personal firefighting protection gear (Bang 2010), a study on the physiological reactions when climbing stairs wearing firefighting rubber footwear and firefighting leather footwear (Huang et al. 2009), and a study on the effects of leather firefighting protective footwear on physical sense of balance (Huh and Bang 2013). Bang (2010) found that the preferences of firefighters for protective gear was in the order of fire suit (3.10), general work wear (3.04), helmet (2.97), leather protective footwear (2.68), gloves (2.6), and rubber protective footwear (2.59). The results of satisfaction analysis of firefighting protection gear showed that satisfaction was highest in order of general work wear (3.21), helmet (3.17), fire suit (3.15), leather protective footwear (2.97), gloves (2.77), and rubber protective footwear (2.75). Analysis of the overall satisfaction of firefighters’ protection gear indicated that there was a need to improve protective footwear for firefighters. The satisfaction rate of protective footwear for firefighters was low because of the thick material used for protection, and the weight and discomfort from metal parts, and bad storage conditions. Huang et al. (2009) conducted physiological analysis while climbing stairs wearing rubber protective footwear and leather protective footwear. Physical fatigue was lower for rubber footwear compared to leather footwear, and flexibility was higher at the knees and the back of the foot. However, there is a lack of studies that analyze designs of protective footwear for firefighters, and develop protective footwear according to the designs and review of current conditions, which could aid smoother field action for firefighters. Therefore, there is a need for a study that will provide specific points of improvement for protective footwear for firefighters, and develop a product based on these points, for improved protection and safe field activities of firefighters. Previous related studies include an analysis of protective footwear products for firefighters (Kang et al. 2015), a review of the current conditions of protective footwear worn by firefighters (Lee and An 2016), and an analysis of protective footwear products and design proposals (Jung et al. 2016). Kang et al. (2015) selected the latest protective footwear for firefighters of different countries and comparatively analyzed them. The products included Sancheong (http://www.sancheong.com), the US brand Globe (http://www.globeturnoutgear.com/boots), the German brand Haix (http://www.haix.com), and the Chinese brand Penco (http://www.shpengke.com). The results confirmed that rubber protective footwear had excellent water resistance and elasticity while leather protective footwear had excellent ventilation, and diverse pattern changes were found to be possible in terms of design. Lee and An (2016) found that the majority of protective footwear for firefighters were in the size range between 260 and 270 cm. The most common foot type was the Greek type, where the second toe is the longest, and regular foot arches were more common than arched or flat types. Jung et al. (2016) proposed two types of combined openings for protective footwear: laces and zipper, and laces and buckle. The laces and buckle type that can adjust size was chosen and thirty designs were proposed with this opening.
The aim of this study is to develop ergonomic, high-sensitive protective footwear for firefighters that considers wearer convenience, based on improvements to protective footwear designs currently worn by firefighters in the field. The specific study goals are as follows: The current conditions of protective footwear worn by firefighters will be examined, designs will be created based on this information for development of a test product, and three designs will be selected for the final proposal. The test products will be created, a survey will be conducted on wearability of the products, and the results will be reported.
Review of current conditions of protective footwear worn by firefighters research subjects
A survey was conducted to examine the current conditions of wearing protective footwear for firefighters. The survey consisted of 12 questions: three questions were on satisfaction of the firefighting belt, three were on comfort, three were on design, and three were on functionality.
Firefighters were asked to rate how often they wear their protective footwear on a 5-point scale. Points of discomfort were divided into eight categories—hard material, narrow width, hard sole, discomfort for ankle, bad functionality, unattractive design, heavy weight, and other—and the respondents were asked to select at least one answer. Points considered when selecting protective footwear were divided into 11 categories—brand, design, price, size, color, material, weight, durability, functionality, after service, and other—and the respondents were asked to select at least one answer.
The respondents were asked about whether or not they experienced injury after wearing protective footwear for long periods of time. Those who said they did were asked to choose at least one of the eight categories of blisters, redness and peeling, burn, swollen feet and tightness, foot aches, pain in sole of foot, pain from overlapped toes, and other. They were also asked to choose at least one of five reasons for injury: size, material, design, unique foot type, and other. Lastly, they were asked to write specific points of improvement.
Satisfaction of design of existing protective footwear for firefighters was examined. Those who answered that they were dissatisfied were asked to choose one of four reasons: shape, color, material, other. They were also asked to choose at least one out of five categories for specific improvement areas: size allowance, ankle size, luminescence, opening, and other.
Satisfaction of the functionality of protective footwear for firefighters was examined. Those who answered that they were dissatisfied were asked to choose one of size areas of function improvement: flame-resistance, water-resistance, ventilation, weight, zipper or cord opening, and other. They were also asked to choose at least one specific area of improvement: ease of wearing, shock-absorption, visibility, opening, and other.
SPSS for windows 22.0 (SPSS Inc. Chicago II, USA) was used to analyze frequency and percentages.
Development and evaluation of improved protective footwear for firefighters
Design selection and production
Five experts, including two professors of clothing and textiles, and three graduate students of clothing and textiles, were asked to evaluate the designs. Three out of the 30 design improvements proposed by previous studies (Jung et al. 2016) on protective footwear for firefighters were selected. The three designs were submitted to the 4th Firefighting Industry Excellent Design Competition hosted by the Korea Fire Industry Technology Institute in June, 2016. The three design improvements submitted to the competition were produced as test products I, II, and III through a collaboration with the company Y. The appearance characteristics of each prototype are as follows. Prototype I used yellow as the point color, and placed a retroreflective fabric on the instep and the back of the foot. Prototype II was red and a retroreflective fabric was placed on the top. Prototype III included yellow and red colors, and a retroreflective fabric was applied as a stripe to the sides of the foot.
Design and wearability evaluation survey
A design and wearability evaluation survey for test products I, II, and III were conducted on October 24, 2016, at Moonkyung STX Resort. Fifty members of the city, do, and firefighting and emergency rescue industry were chosen as advisors and respondents of the survey. Surveys found to have unreliable answers were excluded, and a total of 38 surveys were analyzed. The surveys consisted of 17 questions. There were six questions on the design satisfaction of the test products, 10 questions on wearability and comfort satisfaction, and one subjective question. The design satisfaction questions asked about shape, color, materials, opening, sole, and overall design. The wearability questions asked about size, feel of material, weight, calves, ankles, foot width, foot sole, movability, fit, and overall wearability. SPSS for Windows 22.0 (SPSS Inc. Chicago II, USA) was used for analysis of frequency, percentage, average, and standard deviation.
Current conditions of wearing protective footwear for firefighters
Satisfaction of protective footwear for firefighters in Korea
Worn very often
Inconvenience of shoes for firefighters
Part to consider when selecting shoes for firefighters
Functionality evaluation of protective footwear for firefighters in Korea
Wearing evaluation of protective footwear for firefighters in Korea
Injury experience when worn
Injury type in wearing
Foot sole pain
Skin red dot
Elements of wearing inconvenience of shoes for firefighters
Design evaluation of protective footwear for firefighters in Korea
The points to be considered when improving protective footwear for firefighters, according to the results of the current conditions of wearing the products in Korea, are as follows. There is a need to improve the opening design for size improvements and closer contact at the ankles. There is also a need to improve material considering water-resistance, ventilation, and visibility. Therefore, the new designs proposed a laces and buckle opening instead of the existing pull cord and zipper type. This would make size adjustments possible and improve contact at the ankles. The material for the footwear was proposed as synthetic leather with high water-resistance and ventilation instead of the existing rubber.
Design selection and development of protective footwear for firefighters
Design and wearability evaluation survey on improved test products
Design satisfaction of improved design prototype (N/%)
Wearing satisfaction of improved design prototype (N/%)
The answers to the subjective question on how to improve test product I included ‘Opening should be improved because the size is small and cannot be adjusted’, ‘Longer laces so the calf area can be expanded for easier wearing’, ‘Heavier than existing waterproof footwear’, ‘Conduct wearability tests in high-rise buildings’, ‘Make it easier to pull the shoelaces’, ‘Would like a zipper opening’, ‘The sole is too hard. I think it would be uncomfortable if worn for a long time’ and ‘Needs to be improved because it feels a bit bulky’. The answers to the subjective question on how to improve test product included ‘A buckle can be uncomfortable when wearing a fire suit’, ‘Need to improve tightness at ankles’, ‘Need to make lighter’, ‘Need to improve shock-absorption of soles’, ‘Would like double layer buckles’, ‘Improve opening to velcro or another one-touch type system’, and ‘Add zipper opening’. The answers to the subjective question on how to improve test product III included ‘Need to improve soles. The foot is uncomfortable and it feels like I am carrying the shoe’, ‘Feels like the buckle will get damaged easily’, ‘Need to change to a one-touch opening because it takes a long time to wear with a fire suit’, ‘Need to improve material to make it lighter’, ‘Would like to different heights of footwear so the wearer can choose’, ‘Would like to be able to attach climbing irons to the soles’, and ‘Would like to add a non-slip function to the sole and make the front part stronger’.
The results of the design and wearability evaluation survey on test products I, II, and III showed that more than half were satisfied with the overall design and wearability.
The aim of this study was to develop ergonomic, high-sensitive protective footwear for firefighters that considered comfort of the wearers, active in the field. Therefore, an examination of the current conditions of protective footwear for firefighters in Korea was conducted, and designs were proposed based on the findings. Three designs that were submitted to the Firefighting Industry Excellent Design Competition were developed as test products, and wearability evaluation surveys were conducted on the products.
As a result of analyzing the current conditions of protective footwear worn by firefighters in Korea, it was confirmed that there was a need to improve the opening for better size and a close fit at the ankles. A need was also found to improve water-resistance, ventilation, and visibility, through a change of materials. Therefore, the opening was changed from the existing pull cord and zipper to laces and buckles, which made size adjustments possible and fit closer to the ankles. For materials, artificial leather with high water-resistance and ventilation was selected instead of the existing rubber material.
Test products I, II, and III were developed reflecting the design proposals above. Artificial leather and rubber were used for the test products with improved designs, and the opening was the laces and buckles type. Size adjustments were made possible to fit the body well, and closer contact was created at the ankles. The design and wearability evaluation survey on test products I, II, and III showed that the majority were satisfied with the design and wearability of all three test products.
The limitations of this study and suggestions for future studies are as follows. The range of this study was limited to design proposal and development of test products of protective footwear for firefighters. Future studies should improve the material, and produce protective footwear for firefighters that consider water-resistance, ventilation, and light weight. Ergonomic evaluations should be conducted in an environment with KFI certification, that is similar to the actual environment where firefighters work. The results of this study were development of designs for high-sensitive protective footwear for firefighters that considered convenience for firefighters active in the field, and are expected to be useful as foundation material for research and development of future protective footwear products for firefighters.
SL conceived the work and MK prepared the samples and performed the analyzed. MK and SL are participated in the sequence alignment and drafted the manuscript. Both authors read and approved the final manuscript.
This research was supported by Research Program To Solve Social Issues of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (No. 2015M3C8A7A02027384).
The authors declare that they have no competing interests.
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