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As a core component in the field of wearable smart devices (or \u2018smart wearables\u2019), flexible sensors have the advantages of excellent flexibility, ductility, free folding properties, and more. When choosing materials for the development of sensors, reduced weight, elasticity, and wearer\u2019s convenience are considered as advantages, and are suitable for electronic skin, monitoring of health-related issues, biomedicine, human\u2013computer interactions, and other fields of biotechnology. The idea behind wearable sensory devices is to enable their easy integration into everyday life. This review discusses the concepts of sensory mechanism, detected object, and contact form of flexible sensors, and expounds the preparation materials and their applicability. This is with the purpose of providing a reference for the further development of flexible sensors suitable for wearable devices.<\/jats:p>","DOI":"10.3390\/s22145089","type":"journal-article","created":{"date-parts":[[2022,7,6]],"date-time":"2022-07-06T21:15:52Z","timestamp":1657142152000},"page":"5089","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":55,"title":["The Progress of Research into Flexible Sensors in the Field of Smart Wearables"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4313-1169","authenticated-orcid":false,"given":"Yunlei","family":"Yin","sequence":"first","affiliation":[{"name":"College of Textile, Zhongyuan University of Technology, Zhengzhou 450007, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6882-2949","authenticated-orcid":false,"given":"Cheng","family":"Guo","sequence":"additional","affiliation":[{"name":"College of Textile, Zhongyuan University of Technology, Zhengzhou 450007, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hong","family":"Li","sequence":"additional","affiliation":[{"name":"College of Textile, Zhongyuan University of Technology, Zhengzhou 450007, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hongying","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Textile, Zhongyuan University of Technology, Zhengzhou 450007, China"},{"name":"Henan Province Collaborative Innovation Center of Textile and Garment Industry, Zhengzhou 450007, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fan","family":"Xiong","sequence":"additional","affiliation":[{"name":"College of Textile, Zhongyuan University of Technology, Zhengzhou 450007, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dongyi","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Textile, Zhongyuan University of Technology, Zhengzhou 450007, China"},{"name":"College of Automation Engineering, University of Electronic Science and Technology, Chengdu 611731, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"9139","DOI":"10.1021\/acsnano.9b03454","article-title":"Bioinspired interlocked structure-induced high deformability for two-dimensional titanium carbide (mxene)\/natural microcapsule-based flexible pressure sensors","volume":"13","author":"Wang","year":"2019","journal-title":"ACS Nano"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"213","DOI":"10.1016\/j.cossms.2018.11.001","article-title":"Flexible strain sensors fabricated using carbon-based nanomaterials: A review","volume":"22","author":"Yan","year":"2018","journal-title":"Curr. 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