The Global Recycled Standard (GRS) has become the benchmark for brands that want to prove recycled content claims. For socks, GRS certification transforms waste materials — including ocean-bound plastics and post-industrial textile waste — into soft, durable products consumers love.
From Waste to Yarn
The journey starts with collected plastic bottles or discarded fishing nets. These materials are cleaned, shredded, melted, and extruded into recycled polyester or nylon filament. For cotton-rich recycled socks, post-industrial cotton clippings can be blended with virgin or organic fibers to create recycled cotton yarns.
What GRS Verifies
- Minimum 20% recycled content (with higher percentages eligible for specific label grades).
- Complete chain-of-custody from recycler to finished-goods factory.
- Restricted chemical lists and environmental criteria at each certified facility.
- Social compliance requirements aligned with worker welfare standards.
- Accurate labeling and marketing claims.
Product Applications
GRS materials work across many sock categories. Recycled nylon is popular for performance and compression socks because of its strength. Recycled polyester is common in fuzzy home socks and outdoor styles. Recycled cotton blends are used in casual and fashion socks to reduce agricultural water use.
FOCS GRS Manufacturing
FOCS is GRS-certified for sock production and works with certified yarn suppliers for recycled polyester, nylon, and cotton. We help brands calculate recycled content, choose the right yarn for their target hand-feel, and provide transaction certificates for every order.