Synthetic fibers are produced from petrochemicals or biological feedstocks using industrial processes. Common examples include polyester, nylon, and emerging biosynthetics. These fibers are known for strength, durability, and stretch but they also pose end-of-life challenges, particularly microplastic pollution and fossil fuel reliance.
‍

Polyester dominates global fiber use because of its durability, cost-effectiveness, and performance in activewear and everyday garments. SIERRA’s recycled polyester (rPET) is one of our most produced and sold fibers, highlighting both its importance in today’s textile market and our commitment to a greener environment. By prioritizing rPET, we help reduce dependence on virgin plastics, divert waste from landfills, and lower carbon emissions making a measurable impact on the path toward more sustainable, biodegradable-conscious textiles.
‍

• Everyday Impact
From athletic gear to linings and uniforms, polyester offers fast-drying, stretchable, and wrinkle-resistant qualities.
‍

• Expert Insight: AI is Mapping Fiber Degradation in Real-Time
Advanced sensors now assess fiber condition during recycling and adjust virgin-recycled blend ratios to ensure yarn strength and consistency.
‍

• Real-World Tie-In: Major retailers like H&M and Decathlon have committed to increasing recycled content by 2025. But with under 10 large-scale textile recyclers worldwide, AI-driven sorting systems (e.g., Refiberd, Worn Again) are closing this infrastructure gap.



‍

On the other hand, animal fibers from animals’ coats or hides and are naturally biodegradable. Wool, from sheep, is prized for its warmth and moisture regulation. Leather, sourced as a byproduct of livestock, offers durability and a premium feel. Both materials now face increasing scrutiny for environmental and ethical reasons—but innovation is reshaping how they are sourced and processed.
‍

• Wool’s natural crimp makes it both breathable and insulating perfect for garments that need to retain warmth while allowing airflow. SIERRA is committed to explore Responsible Wool Standard (RWS)-aligned sourcing and regenerative grazing models.
‍

• Everyday Impact
Wool garments from base layers to blazers regulate temperature, resist odor, and offer long-term durability with minimal washing.
‍

• Expert Insight: Regenerative Grazing for Climate Impact
Some wool producers now use rotational grazing systems that increase soil carbon capture and reduce methane intensity, showing wool’s potential for climate-positive certification.
‍

• Real-World Tie-In: Pilot projects in Australia and New Zealand are being certified as “climate-positive wool farms,” offering a transparent path for brands looking to validate low-impact sourcing.

‍

Understanding Origin to Shape Impact

Every fiber whether it comes from a plant, a tree, a lab, or a landfill carries a beginning that defines its future. Tracing that origin unlocks a deeper respect for what we wear and pushes the industry toward smarter, cleaner, more innovative practices.
‍

We believe that fiber selection is not just a sourcing decision it’s a statement of values. That’s why we work at the source: with growers, scientists, recyclers, and mills to ensure that what we produce is not only high-quality, but high-integrity.
‍

Because from raw to real, it all starts with the fiber.

‍