Recycled Polyester Production of a polyester fabric involves significant quantities of chemicals, raw materials, and by-products that are toxic and can pollute water and air and cause health. Unlike polyester, recycled polyester uses PET as the raw material. This is the same material that is used in clear plastic water bottles and recycling it to create the fabric prevents it from going to landfill. Tencel Lyocell Tencel is a branded lyocell fiber that comes from the pulp of trees which is dissolved in a non-toxic organic solvent. Lyocell is produced using a closed loop system which has minimal impact on the environment and maintains economical use of energy and water. Unique physical properties of Tencel Lyocell fibers lead to their great strength, efficient moisture absorption and gentleness to skin.