Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Fibers was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 22 days and the median time to publication was 65 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Akanshu Sharma | Krzysztof Jamroziak |
| Alain Dufresne | Krzysztof Śledziewski |
| Alan K. T. Lau | Lan-Ying Jiang |
| Alessio Cascardi | Laura Aliotta |
| Alexandr Volyar | Leszek Mazur |
| Alexandru Mihai Grumezescu | Li Li |
| Alke Petri-Fink | Li Yu |
| Amir Fam | Limin Xiao |
| Amit Kenny | Lluís Gil |
| Amit Sharma | Longbang Qing |
| Amod A. Ogale | Lucian Lucia |
| Ana-Maria Iordache | Luciano Ombres |
| Anastasia Penkova | Luís Pinho |
| Andou Yoshito | M. Z. Naser |
| André Furtado | Maciej Robert Dutkiewicz |
| Andrea Bloise | Maciej S. Kumosa |
| Andreas Krause | Maciej Szeląg |
| Andres Salas Montoya | Madina Jelbuldina |
| Andrew Churg | Magnus Engholm |
| Andrey Pryamikov | Mahmoud Reda Taha |
| Anil N. Netravali | Małgorzata Lenart |
| Anna Strzelewicz | Manish Kewalramani |
| Anna Wróblewska | Maria Bostenaru Dan |
| Antigoni Barouni | María Cristina Area |
| Anton Chepurnenko | Maria Wesołowska |
| Antonios Arvanitis | Marija Gizdavic-Nikolaidis |
| Anuj Kumar | Marilena Vlachou |
| Aravin Prince Periyasamy | Mario Zitelli |
| Arezoo Campbell | Mariusz Fabijański |
| Artem Belesov | Martha Verónica Escárcega Bobadilla |
| Arthur J. Ragauskas | Martin C. Richardson |
| Atsushi Takahara | Martin J. D. Clift |
| Babar Shabbir | Martyna Grzegorzek |
| Balázs József Nagy | Mataz Alcoutlabi |
| Biao Hu | Matej Komanec |
| Bin Liu | Mateusz Koziol |
| Borwen You | Matteo Strozzi |
| Carlo Santulli | Mazeyar Parvinzadeh Gashti |
| Carlos Chastre | Md Ashraf Hossain |
| Catalin Zaharia | Mehran Khan |
| Chang-Seop Lee | Mei-Chin Lu |
| Chaoyang Ti | Messaoud Saidani |
| Chhabilal Regmi | Michael Bertocchi |
| Chi-wai Kan | Michael Ciesielski |
| Christian Kramberger | Michael Lorenz |
| Christina Scheffler | Michaela Gkantou |
| Christopher Hunt | Milad Kamkar |
| Chul Ho Park | Min Wook Lee |
| Claudia Sergi | Ming-Yuan Shen |
| Claudio Larosa | Mislav Stepinac |
| Claudio Tonin | Mohamad Midani |
| Constantin Chalioris | Monica Jung de Andrade |
| Cristina Mihaela Nicolescu | Morshed Khandaker |
| Czesław Bywalski | Muhammad Junaid Munir |
| Dae-Jin Kim | Murilo Araujo Romero |
| Daguan Huang | Mustafa Rajabali |
| Daicong Da | Narayan Bhattarai |
| Damian Nakonieczny | Nawar Kadi |
| Damien Soulat | Neelima Mahato |
| Daniel Jáuregui-Vázquez | Nima Rahbar |
| Darrel Nicholas | Ning Pan |
| David Garoz | Noureddine Abidi |
| David Harper | Nuray Baser |
| Dejana Javoršek | Nyan-Hwa Tai |
| Dmitriy Beznosko | Oleg Morozov |
| Dobrota Dan | Omid Hosseinaei |
| Dong Joo Kim | Orlando J. Rojas |
| Donguk Choi | Patrizia Cinelli |
| Edina Rusen | Paulo Caldas |
| Elena Anashkina | Pavel Peterka |
| Elias P. Koumoulos | Pedro Raposeiro Da Silva |
| Emilia Mihaylova | Peng Gao |
| Emilia Stelmach | Philip R. Barnett |
| Enzo Martinelli | Piotr Bonkowski |
| Erasto Armando Zaragoza Contreras | Polina Tyubaeva |
| Erik Schartner | Pratheep Kumar Annamalai |
| Fabrizio Barberis | Qian Zhang |
| Faiz Shaikh | Radu Muntean |
| Falk Liebner | Raed Abu-Reziq |
| Fanqing Frank Chen | Ramiro Rafael Ruiz-Rosas |
| Fatima Bento | Ravi Kiran Yellavajjala |
| Fausto Minelli | Rebecca Ibach |
| Federica Poli | Rechana Remadevi |
| Felice Gesuele | Remigijus Ivanauskas |
| Filip Chylinski | Rimvydas Milasius |
| Filip Todorov | Robert Guidoin |
| Flora Faleschini | Robert Kusiorowski |
| Francesco Bencardino | Rodgers Mugume |
| Francesco Branda | Ruslan Ibragimov |
| Francois Boussu | Saeed Olyaee |
| Frank Ko | Sagar Roy |
| Fu-Kuo Chang | Saja M. Nabat Al-ajrash |
| Gea Guerriero | Salvatore Verre |
| George Graham Allan | Sarath Mercedes Vega Gutiérrez |
| Georgiy Kagramanov | Saverio Spadea |
| Gheorghe Nechifor | SeChin Chang |
| Gian Piero Lignola | Sergey I. Gutnikov |
| Giancarlo C. Righini | Sergey V. Klyuev |
| Giovanna Rizzo | Shingo Yokota |
| Giovanni Minafo | Shuai Chen |
| Giovanni Mongelli | Shuo Yang |
| Giuliano Zabucchi | Simona Badilescu |
| Go Yamamoto | Smitha Rao |
| Goshtasp Cheraghian | Song Gao |
| Gu Li | Sorin Vlase |
| Guillermo Salceda-Delgado | Sousa Javan Nikkhah |
| Gunasekaran Murali | Stanley Udochukwu Ofoegbu |
| Guozhao Ji | Stavroula Nanaki |
| Gurunathan Thangavel | Stefan Spirk |
| Gutru Rambabu | Stefan Wabnitz |
| Hafeezullah Memon | Stefania Racovita |
| Hanna Stawska | Steffen Loft |
| Hayder Rasheed | Stuart Leigh Phoenix |
| Hyun Do Yun | Sufen Dong |
| Ibukun Oluwoye | Sushanta Ghoshal |
| Igor Makarov | Tadeusz Łagoda |
| Il-Woo Nam | Takunori Taira |
| Inês Flores-Colen | Theodore Ganetsos |
| Ismael Torres-Gomez | Theodoros Rousakis |
| Ivan Giorgio | Thomas Mayer-Gall |
| Iván Herrero-Durá | Thomas Rosenau |
| Ivan Hollý | Tiina Nypelö |
| Ivan Klement | Tiziana Fuoco |
| Ivan Nikolaevich Erdakov | Tomasz Wejrzanowski |
| Ivana Salopek Čubrić | Tommaso D’Antino |
| Izabela Zglobicka | Ton Peijs |
| Jaeryong Yoo | Ulf Germgård |
| Jan Pizoń | Ulrich Heisserer |
| Jana Braniša | Umesh P. Agarwal |
| Jerzy Bobiński | Valentina Mazzanti |
| Jinho Lee | Valerio Belardi |
| Jinlian Hu | Valerio Romano |
| Joanna Kujawa | Vijay Kumar Thakur |
| John W. Gillespie | Vikram Dey |
| Jonathan Phillips | Vincenzo Fiore |
| Jong Won Kim | Violetta Kytinou |
| Ju Dong | Vladimir Bredikhin |
| Juan A. Delgado-Notario | Vladimir Volkov |
| Juan Carlos Cabanelas Valcárcel | Walter Belardi |
| Julian Ajith Thamboo | Wayne E. Jones |
| Julius Vengelis | Wei She |
| Jure Žigon | Wojciech Pisula |
| Jurgis Porins | Xavier Gabrion |
| Kamal Kishor | Xiangwu Zhang |
| Karol Szubert | Xiangxiong Kong |
| Katarzyna Mróz | Xiaoqing Xu |
| Kazem Reza Kashyzadeh | Xinzhong Li |
| Kenneth L. Reifsnider | Xusheng Du |
| Kheng-Lim Goh | Yafei Qiao |
| Kinga Korniejenko | Yaming Pan |
| Kira E. Vostrikova | Yong Xu |
| Konstantinos Beltsios | Yoshito Ando |
| Konstantinos Tsongas | Yung-Jin Weng |
| Koon-Yang Lee | Yuri Lvov |
| Koretaro Takahashi | Yushi Liu |
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