Most of Baserange's underwear is made of bamboo fibers, because of its softness and lightness. Bamboo yarn is not as cotton, which is a mechanical produced yarn, bamboo needs a chemical treatment for the spinning, so it can not be organic certified. Still bamboo is considered sustainable as it needs very little pesticides and agrochemicals. Water consumption is very small too, and it needs very little land space to grow, unlike cotton. Naturally disease and pest resistant, bamboo is also fast growing. Compared to trees, certain varieties of bamboo can grow 1–4 ft long per day, and can even branch and expand outward because of its underground rhizomes.