Both fabrics are customs designed and manufactured from natural fibers which are sourced from wood pulp. The environmental impact of the manufacture of both of these fabrics is significantly lower than regular cotton fabric. MicroModal is manufactured from sustainably grown and harvested Beech trees, typically sourced from European forests. The fabric is of a higher gauge weave and blended with licenced Dupont Lycra resulting in an ultra-light, ultra-soft, cool stretch fabric which moves effortlessly with your body and feels sensational. Bamboo Rayon is manufactured from sustainably grown and harvested bamboo plants from China. These are not the same species of Bamboo plants which pandas eat so we do not impact on the vulnerability of these animals. The fabric is of a lower gauge weave and also blended with licenced Dupont Lycra resulting in a stronger and harder wearing fabric which is more moisture absorbent and cooler than regular cotton underwear fabric.