© 2018 Slovak University of Technology in Bratislava. All rights reserved.Dynamic vapour sorption is used to gain valuable information concerning the sorption behaviour of cotton fibres during their development. Moisture sorption isotherms for cotton fibres are obtained through dynamic vapour sorption analyser during their development stages. The developing cotton fibres exhibited variable dynamic moisture sorption behaviour. The sorption rate is found to be closely related to the structural and compositional changes in cotton fibres during their maturation process. This study provides valuable insights into the driving principles of the moisture sorption process of cotton fibres may aid to develop ways to improve the moisture management properties in general.