The need of the hour on the growing demand for easy accessibility, availability, strength, less weight, eco-friendly and other human-desired materials for day-to-day construction, had focused the research on natural fibers and their properties. Their arise helped to achieve eco-friendly bioscience by establishing healthy and prolonged life with style. Their abundance existence in nature and especially in the local market of the common man proved them worthy substitutes for manufactured materials on excessive resource consumption. The major disadvantage of natural fibres application was researched to be the bonding between fiber surface and matrix, to overcome such difficulty. The result of treatment on surface roughness and fiber fibril changes was linked to tensile strength improvement and water absorption reduction. Many works were done to study the work of NF based on their tensile strength and absorption properties by altering their medium of immersion or using the medium as a modification. The current work focused on the physical and mechanical properties of locally available economic fibers such as Sisal, Coir, Banana and Palmyra fibers and reported their effect under consecutive 15 cycles immersion of alternate wet–dry cycles on their diameter, water absorption, and tensile strength.