Kapok, also known as plant down, is the silky soft and extremely light hollow fiber of the kapok tree. Kapok is similar to down and thus isolates excellently. Furthermore, kapok is water-repellent due to its natural wax film and dries quickly.
The fiber repels moths and mites and is antimicrobial and hypoallergenic. Under sustainability aspects kapok scores too!
The kapok trees are wild growing and flourish without any artificial irrigation or fertilization. The kapok fruit is no food and as the trees can naturally grow pretty much everywhere, they don't need farmland.