Tencel vs polyester: what's the difference?

Tencel and polyester represent fundamentally different approaches to textile production. Tencel lyocell is made from renewable wood pulp using a closed-loop process, is fully biodegradable, and does not shed microplastics. Polyester is a petroleum-based plastic (polyethylene terephthalate) derived from fossil fuels, and it sheds microplastic fibers with every wash — an estimated 700,000 microplastic particles per load of laundry. These particles enter waterways, accumulate in ecosystems, and have been found in human blood and breast milk.

Performance-wise, polyester has long dominated activewear because it is cheap, lightweight, durable, and moisture-wicking. However, Tencel matches or exceeds polyester in moisture management, breathability, and softness. Tencel is also naturally antibacterial, meaning it resists odor without chemical treatments, while polyester famously develops persistent odor that is difficult to eliminate. The main area where polyester still holds an advantage is in raw tensile strength and cost — polyester remains significantly cheaper to produce.

At ONDU, we curate exclusively natural and plant-based fabrics because we believe the environmental and health costs of polyester outweigh its performance benefits. Brands like Reprise Activewear have demonstrated that 100% Tencel activewear can deliver four-way stretch, moisture-wicking, and compression performance without any plastic. The switch away from polyester is one of the most impactful changes you can make for both personal health and the environment.