The aim was to establish the influence of the tent fabric properties on the indoor tent climate. The first step was to thoroughly characterize a series of representative tent fabrics. The chosen route to quantify the influence of the tent fabric on comfort was first to establish the definition of thermal comfort and the related physical parameters. Comfort is connected to thermal comfort and the occurrence of condensation at the tent surface. Secondly, models for the influence of the fabric properties on those physical parameters were set-up. Finally the results of the fabric characterization were included in the model.