Feel the softness of soy fibre and organic cotton This is a lightweight ribbed crewneck shirt made with soy fibre and organic cotton. Features a slim fit and full length sleeves. Soy fibre is made from the pulp leftover from processing soybeans into tofu and other items. This material not only turns food waste into a new resource; it's also so incredibly soft and comfortable it's often referred to as "vegetable cashmere".