Kapok — A Fibre Grown by the Forest

Long before it becomes a textile, kapok grows high above the ground, inside the seed pods of the Ceiba pentandra tree. Native to tropical regions and widely grown across Southeast Asia, the kapok tree produces pods filled with an exceptionally fine, silky fibre that surrounds its seeds.

Unlike cotton, which is cultivated as an agricultural crop, kapok is harvested from trees. Once mature, the pods are collected and opened, and the soft fibres are separated from the seeds. The tree can continue producing year after year, while requiring relatively little agricultural intervention.

What makes kapok particularly remarkable is its microscopic structure. Each fibre is formed like a tiny hollow tube, with a central cavity accounting for approximately 80–90% of its volume. This means that much of the fibre is, quite literally, air. The structure gives kapok its extraordinary lightness as well as its natural insulating properties.

A thin layer of natural wax covers the surface of the fibre, making raw kapok naturally water-repellent. Combined with its hollow structure, this creates a material that is exceptionally light, warm for its weight and naturally buoyant.

These same qualities also make kapok challenging to transform into cloth.

Kapok fibres are shorter, smoother and more brittle than cotton fibres. Their smooth surface gives them relatively little cohesion, making pure kapok difficult to spin into a stable yarn. For textile applications, kapok is therefore often blended with another natural fibre, such as cotton, which provides the strength and structure necessary for spinning and weaving.

The resulting fabric brings together complementary characteristics: the stability and familiarity of cotton with the lightness and distinctive hollow structure of kapok.

Research into kapok-cotton textiles has found that these blends can offer good moisture and water-vapour transmission as well as enhanced warmth retention compared with pure cotton — qualities linked to kapok's highly porous structure.

The fabric has a light, dry and delicate character. Rather than feeling dense or heavy, it carries a sense of air within its structure — a physical quality directly connected to the architecture of the fibre itself.

Kapok also offers an interesting alternative to conventional fibre agriculture.

Cotton cultivation can require significant quantities of water, fertilisers and pesticides, although its environmental impact varies greatly according to region and farming method. Kapok trees, by contrast, can grow in tropical environments with little irrigation or chemical intervention.

The fibre is harvested from the tree's seed pods rather than from the tree itself. The tree remains standing and continues its natural cycle of flowering and fruiting.

For us, this difference is important. Sustainability is not simply a question of replacing one fibre with another; it is about understanding the systems behind a material — how it grows, how it is harvested, who transforms it and which forms of knowledge are preserved through its production.

ONO-Project sources its kapok textiles through associations working directly with artisanal communities.

These organisations help preserve traditional textile knowledge while creating opportunities for craftspeople to maintain greater economic independence through their work. Fibres are not understood simply as raw materials, but as part of a wider network connecting landscapes, techniques and communities.

Working with these textiles means accepting their particularities. Small irregularities, variations in texture and the traces of manual processes are not imperfections to be removed. They are evidence of the material's origin and of the hands involved in transforming it.

Kapok represents an approach to textiles that we find increasingly important: using what a landscape can produce with relatively little intervention, working with the inherent qualities of a fibre rather than forcing it into uniformity, and allowing material innovation and traditional knowledge to exist together.

A fabric begins long before it reaches the body. With kapok, it begins with a tree, a seed pod, air — and the knowledge of how to turn an exceptionally fragile fibre into cloth.