The work presents a structural computational model developed for investigation of heat and air–water vapor massexchange between the multilayer textile packages and the human body. Each fabric layer is represented by a singleelement, characterized by its air and water vapor permeability, thermal resistance and heat capacity, as well as, watervapor absorption properties. While characteristics of each layer are obtained experimentally, the computational modelenables the prediction of the variation in time of temperature and humidity in the gaps between each pair of adjacentlayers. The finite element, which represents the forced ventilation layer made of three-dimensional textile material, iscreated and may be used as a structural element within the overall structural model of the textile package. The elementequations are derived on the basis of ideal gas state equation. The results of the measured textile layers characteristicsand the numerical data are presented. Though the condensation of water vapor was not considered in this model, thetime point of initiation of sweating at given heat and water vapor generation rates could be predicted.