Kapok or capok is a natural, cellulosic fiber. It is obtained from the seed hairs of kapok trees (Ceiba pentandra). Kapok is also called as silk cotton or java cotton. It is smooth, lightweight, unicellular, cylindrically shaped, hollow body, and very buoyant, and twist less fiber. But it quickly breaks down. Kapok fibers on its own are not suitable for spinning into yarn. Cause is very smooth, slippery and brittle. Therefore, fiber is difficult to spin into yarns.

The specialty of the kapok fibre is, its yellowish color or light-brown with a silk-like luster. In contrast to the cotton fiber, the kapok fiber has single-celled plant hairs. This fiber is conventionally used as stuffing for insulation against sound and heat, and for bedding, life preservers, and other water safety equipment, sowing to its hollow air-filled lumen and high void content. Because of its excellent buoyancy. Due to have some unique features, kapok fiber-based materials have created area of opportunities in the various application fields.