The study on the fabric construction characteristics was carried out in 2011 in College of Home economics, University of Peshawar. The wool blended fabrics were divided into two groups according to the source of the fabric; Group 1 comprised of Bannu Woolen Mills Limited while Group 2 contains the fabrics of Lawrencepur Woolen and Textiles Mills. The study describes the fabric construction characteristics such as Threads per Inch (T.P.I) and Weight per Unit Area and its influence on the performance of the woolen blended fabrics. It was found that fabrics which have high thread per inch and weight per unit area have the closely constructed weave and suitable for winter wear. The values for both groups varied in the reading and the performance characteristics were observed to be influenced according to the values of the fabric construction characteristics. The average highest thread per inch belongs to Group 2 i.e. 42 to 78 in warp and 36 to 70 in weft direction. The weight per unit area of Group 1 was found to be from 139.25 to 289.5 g/m2 and in Group 2, it was 188 to 269 g/m2. The higher the thread count and weight per unit area, closer weave pattern and strength was obtained.Keywords: Threads per inch, weight per unit area, weave pattern, wool blended fabric