Natural rubber (NR) has high structural regularity and therefore high abrasion and tear resistance. In addition, NR widely used as a main matrix in the rubber industry to have high strength, excellent adhesion to steel cord, low hysteresis, low rolling resistance, etc. In order to meet the tire performance characteristics, natural rubber is used together with textile cords, which are the main support material and provide the tire with dimensional stability. The main textile cords widely used are poly (ethylene terephthalate) (PET), Nylon, Aramid and rayon. Because of the polarity difference between these polymeric textile cords and the rubber matrix, the interface interaction is insufficient. For this reason, the resorcinol formaldehyde latex (RFL) dipping process is used to obtain desired adhesion between textile cord and rubber matrix. However, the RFL method is both toxic and harmful to the environment as well as time-consuming and costly. The aim of this study is to eliminate these negative effects by using acrylic polyhedral oligomeric silsesquioxanes (A-POSS) a new generation nanofiller instead of RFL and to improve the adhesion between rubber and aramid textile fibers. Adhesion characteristics of the compounds have been investigated by means of strip H-adhesion tests and thermodynamic work of adhesion (TWA) measurements. TWA was calculated by using the surface free energy components of the compounds and fibers. The correlations between H-adhesion strength values and the TWA were studied to understand the adhesion mechanism. It was demonstrated that the utilization of A-POSS in the NR composites improved the adhesion of the Aramid fiber. Acknowledgement: This study was granted by The Scientific and Technological Research Council of Turkey (TUBITAK) (Project No: 116M587).