Shop Natural Fiber Activewear
What Natural Fiber Actually Means in Activewear
Natural fiber refers to textile fibers derived from plant or animal sources rather than synthesized from petrochemicals. In activewear, the dominant fibers are polyester and nylon, both petroleum-derived plastics. Natural fiber alternatives include cotton, wool, and cellulosic fibers such as TENCEL Lyocell. Of these, TENCEL Lyocell is the most technically suited to activewear. A study published in the Journal of Natural Fibers (Ozdil et al., 2012) found that lyocell fabrics demonstrated superior moisture transport and breathability compared to polyester under equivalent test conditions. Cotton, while natural, absorbs moisture and holds it against the skin, creating discomfort during movement. TENCEL Lyocell moves moisture away from the skin and releases it through evaporation, making it the natural fiber with the strongest performance case for activewear use.
How TENCEL Lyocell Is Made
TENCEL Lyocell is produced by Lenzing AG from wood pulp sourced from sustainably managed forests. The production uses a closed-loop solvent spinning process in which over 99% of the solvent is recovered and reused, according to Lenzing AG's published manufacturing documentation. This process is fundamentally different from the production of conventional rayon and viscose, which use open-loop processes that release chemical waste. The resulting fiber carries OEKO-TEX Standard 100 certification at the fiber level, confirming it has been tested free from harmful substances at that stage. Bellissima's finished garments are 92% TENCEL Lyocell and 8% spandex. The finished product does not currently hold a separate OEKO-TEX finished-product certification.
What Natural Fiber Activewear Is Best For, and Its Honest Limits
Bellissima's natural fiber activewear is designed for low to moderate intensity movement: yoga, pilates, barre, reformer workouts, walking, and recovery. In these contexts, TENCEL Lyocell's moisture management and breathability perform well against synthetic alternatives. At high-intensity sustained output, such as distance running, HIIT, or hot yoga at elevated temperatures, the fiber's moisture capacity reaches its limit in a way that synthetic technical fabrics are engineered to handle. This collection does not claim fitness for those use cases.
Frequently Asked Questions
Is TENCEL Lyocell a natural fiber?
Yes. TENCEL Lyocell is classified as a natural cellulosic fiber. It is derived from wood pulp, a plant-based raw material, using a manufacturing process that regenerates the cellulose into fiber form. It is distinct from synthetic fibers such as polyester and nylon, which are derived from petroleum.
How does natural fiber activewear compare to synthetic activewear?
Synthetic activewear made from polyester and nylon offers high durability and engineered moisture-wicking through chemical treatments. The trade-offs include microplastic shedding during washing, PFAS-based finishing treatments on some products, and petrochemical sourcing. Natural fiber activewear made from TENCEL Lyocell achieves moisture management through the fiber's physical structure rather than chemical treatments, and sources from wood pulp rather than petroleum. The performance ceiling is lower at maximum intensity. For low to moderate activity, the natural fiber option is the stronger choice on health and environmental grounds.
What is the fabric composition of this collection?
All four pieces are 92% TENCEL Lyocell and 8% spandex. The spandex component provides the stretch and recovery necessary for activewear fit. The leggings and shorts are 240 GSM, fully opaque, and squat-proof.
Is TENCEL Lyocell OEKO-TEX certified?
The TENCEL Lyocell fiber carries OEKO-TEX Standard 100 certification through Lenzing AG at the fiber level. Bellissima's finished garments do not currently hold a separate finished-product OEKO-TEX certification. We state this distinction clearly.
Does natural fiber activewear last as long as synthetic?
TENCEL Lyocell is durable under correct care conditions. It requires cold or warm washing and low-heat or air drying. High heat degrades the fiber faster than it degrades polyester. With correct care, Bellissima's pieces are built for long-term use, not fast fashion replacement cycles.
What activities is this collection suited for?
Yoga, pilates, barre, reformer, walking, and low-impact training. Not recommended for sustained high-intensity formats including running, HIIT, spin, or hot yoga at 105 degrees Fahrenheit.
Sources
Ozdil, N., et al. (2012). Moisture Management Properties of Woven Fabrics Produced from Regenerated Cellulose Fibers. Journal of Natural Fibers.
Lenzing AG. (2024). TENCEL Lyocell Production Process and Certification Documentation. Lenzing AG.
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