The expectations from fabrics and clothes go up as a result of increase in life standard of people, as well as strength, esthetics design and fashion. Parallel to this, today’s people expect different properties from clothes and fabrics such as sensing comfortable both at working and free times. In this context, clothing becomes important. Clothing comfort is dependent upon the low stress mechanical, thermal and moisture transfer properties of the fabrics. In this study, air permability, water vapor permability, heat and moisture transfer of weft backed woven fabrics, which are important comfort properties for clothes and garment, have been investigated. And the mechanical properties of fabrics including bending rigidity, formability and bagging fatigue were also calculated and the results were analyzed. The effects of raw materials (cotton, polyester, viscose, modal) and weft yarn density (25,35,45) on these properties have been analyzed graphically and statistically. Increasing weft yarn density lead to decreases in porosity, resulting in decresed air and water vapor permability and moisture transmission. The results of this research show that the formability signi?cantly increased with weft density, whereas bagging fatigue decreased accordingly. the surface area of the radar chart calculated using AUTO CAD software. The best sample was selected from all the specimens and the ideal cinditions for creating weft backed fabrics with the goal of reaching a desirable convenience were determined. With regard to all the parameters of the fabric, sample of modal/viscose was selected as the optimum sample
