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Organic Cotton Interlock Fabric
-- Steady & Reliable Manufacturer --
Overview
Our organic cotton interlock is a double-knit fabric produced from OCS-certified organic cotton, offering a smooth surface on both faces, greater dimensional stability than single jersey, and the certified organic fiber credentials that make it a preferred base fabric for underwear, baby clothing, and premium everyday T-shirts. Its double-knit structure provides better coverage and edge stability than organic cotton jersey at equivalent weights — a practical manufacturing advantage for clothing factories working with certified organic cotton at premium fiber cost.
Introduction
Interlock fabric's double-knit construction — two interlocked courses of rib — produces a fabric with a smooth, clean surface on both interior and exterior faces, no edge curl, and greater opacity and body than single jersey at equivalent weights. These structural properties directly address practical garment production requirements: clothing factories using interlock instead of jersey experience less cutting waste from edge curl, better pattern accuracy, and more consistent seam quality in sensitive applications such as underwear and baby clothing. Combined with OCS-certified organic cotton fiber, organic cotton interlock serves the intersection of structural performance and verified sustainable sourcing that an increasing number of brand buyers and retail programs require.
Nantong Tianhong Textile Technology Co., Ltd. produces organic cotton interlock under OCS and OEKO-TEX® Standard 100 certification, with our full supply chain independently audited by third-party certification bodies. We are one of the first manufacturers globally to adopt the OCS label for organic products, providing consistent, auditable documentation across development and bulk production. Optional spandex incorporation is available for stretch applications. We supply organic cotton interlock that is certifiably matched to our organic cotton jersey, rib, french terry, and fleece ranges — supporting full-garment OCS certification from a single supplier. Sample production is completed within 15 days.
Specification
| Fiber Content | 95% Organic Cotton, 5% Spandex (100% organic cotton available) |
| Fabric Weight | 160–220 gsm |
| Width | 150–160 cm (59–63 inches) |
| Construction | Interlock (Double Knit) |
| Shrinkage | ≤5% (after pre-washing) |
| Certification | OCS, OEKO-TEX® Standard 100 |
| Customization | Weight, spandex ratio, color, and width available upon request |
Application
- Certified Organic Underwear and Bodywear: The smooth double-sided interlock surface, OCS-certified organic fiber content, and OEKO-TEX® restricted substance compliance address the three primary documentation requirements for certified organic underwear retail programs — organic content, skin safety, and a clean, comfortable interior surface in direct contact with the wearer.
- Baby and Infant Clothing: OCS organic content certification and OEKO-TEX® Standard 100 restricted substance certification meet the dual documentation requirements for baby and infant product categories across major retail markets in the USA, Europe, and South Korea — both the organic material claim for parent-facing brand communication and the chemical safety compliance for retail compliance programs.
- Premium Organic T-shirts: Interlock's greater opacity, body, and edge stability versus single jersey upgrade product quality in fitted organic T-shirts — a practical manufacturing and consumer quality benefit that justifies the modest fabric cost premium over organic cotton jersey in premium basics price tiers.
- Sleepwear and Pajamas: The smooth double-sided surface, certified organic fiber, and comfortable hand feel make organic cotton interlock appropriate for sleepwear and pajama applications where direct skin contact through extended overnight wear makes fabric quality and chemical safety both critical buyer requirements.
- Coordinated Organic Basics Sets: Organic cotton interlock can be matched to our organic cotton jersey, rib, and french terry fabrics — enabling clothing factories to source all certified organic components for coordinated basics sets from a single certified supplier with consistent OCS documentation across all components.
Advantage
- Double-Sided Smooth Surface for Skin Contact Quality: Interlock's smooth face on both sides means the interior surface in direct skin contact is as clean and smooth as the exterior — a direct quality and comfort advantage over single jersey in underwear, baby clothing, and sleepwear where the loop back of jersey construction contacts skin and can affect wearer comfort during extended use.
- No Edge Curl for Efficient Certified Organic Garment Production: Unlike single jersey, interlock does not curl at cut edges — a practical manufacturing advantage for clothing factories that reduces cutting waste, improves pattern accuracy, and simplifies quality control in underwear and baby garment production. When working with premium-priced organic cotton, minimizing fabric waste in production is a direct cost efficiency benefit.
- Greater Opacity at Lower Weight: The double-knit structure of interlock provides better coverage and opacity than single jersey at the same or lower weight — allowing brand buyers and factories to achieve coverage requirements without increasing fabric weight, a direct cost efficiency in organic cotton where fiber cost is higher than conventional cotton alternatives.
- OCS and OEKO-TEX® Dual Certification: The combination of OCS organic content certification and OEKO-TEX® Standard 100 restricted substance certification provides the dual documentation required by major retail buyers for organic baby and skin-contact products — organic fiber provenance and chemical safety, both independently verified, from a single certified supplier.
- Full Certified Organic Range Matching: Organic cotton interlock is produced from the same certified supply chain as our organic cotton jersey, rib, french terry, and fleece — enabling clothing factories to source all certified organic fabric components for a complete garment range from Nantong Tianhong, simplifying the OCS transaction certificate chain and reducing supplier management overhead.
Why Choose Us
- Pioneer OCS Organic Manufacturer — Established Full Supply Chain Audit: We are one of the first manufacturers globally to adopt the OCS organic label. Our OCS certification covers the complete supply chain from organic cotton raw material through spinning, knitting, dyeing, and finishing — independently audited by third-party bodies and continuously maintained, not batch-by-batch. For buyers managing multi-season retail sustainability compliance, our established certification process provides reliability that newer certified suppliers cannot guarantee.
- Complete Certified Organic Knit Fabric Range: Organic cotton interlock, jersey, rib, french terry, and fleece are all produced under OCS certification from our certified supply chain — enabling clothing factories to source all certified organic fabric components for a complete garment range from a single certified B2B supplier, eliminating documentation gaps between suppliers and simplifying compliance management.
- Dual OCS and OEKO-TEX® for Baby and Skin Contact Categories: The combination of OCS and OEKO-TEX® Standard 100 certifications meets the dual documentation requirement standard in baby, infant, and skin-contact product categories across all major export markets — both organic content for brand marketing and restricted substance compliance for retail program compliance, from one certified manufacturer.
- Fast OCS Documentation and Development Support: OCS transaction certificates are issued as standard with every certified organic order. We respond to all inquiries within 24 hours. Fabric communication is completed within 3 days and development samples within 15 days — supporting the documentation and development timelines required by seasonal basics, underwear, and baby clothing buyers.
- Scalable Production for Organic Programs: Production capacity of up to 1,000 tonnes of knitted fabric per month with 500+ sets of equipment supports reliable delivery for certified organic interlock programs — from initial development sampling through to large seasonal bulk orders for retail and private-label programs globally.
FAQ
- Q: Why use organic cotton interlock instead of organic cotton jersey for baby clothing?
- Interlock presents a smooth surface on both faces — including the interior face in contact with the baby's skin — and does not curl at cut edges. These properties improve skin comfort and production efficiency compared to jersey, where the looped back face contacts skin and edge curl creates additional handling steps in garment production. For baby clothing where quality and production efficiency both matter, interlock is the preferred construction.
- Q: Can you provide OCS transaction certificates for each interlock order?
- Yes. OCS transaction certificates are issued as standard for all certified organic orders. Our full supply chain is independently audited and we maintain continuous certification — providing consistent documentation quality across all orders. Please specify your documentation format requirements at inquiry stage.
- Q: Is a 100% organic cotton version without spandex available?
- Yes. A 100% organic cotton interlock without spandex maintains full OCS certification with 100% organic fiber content — preferred by buyers requiring 100% organic labeling without any synthetic fiber component. Please specify at inquiry stage.
- Q: Can organic cotton interlock be matched to organic cotton jersey and rib for coordinated sets?
- Yes. Our organic cotton interlock, jersey, rib, french terry, and fleece fabrics are all produced under OCS certification from the same certified supply chain — enabling color and certification matching across all fabric components for a complete certified organic garment range from a single supplier.
- Q: What are the lead times for organic cotton interlock samples and bulk production?
- We respond within 24 hours on business days. Sample production is completed within 15 days. Bulk lead times are confirmed at order stage based on volume and current production schedule.
Payment & Shipping
- Payment Terms: We accept T/T (bank transfer) and L/C (letter of credit). For bulk orders, a 30% deposit is required before production, with the balance payable upon receipt of the bill of lading.
- Quotation: Prices are quoted based on your preferred trade term — FOB, CIF, CNF, or others — confirmed during the inquiry process.
- Sampling: Fabric communication is completed within 3 days; sample production is completed within 15 days.
- Lead Time: With a stable supply chain, we accurately control production schedules to ensure on-time delivery.
- Stock Availability: We maintain a range of fabrics in stock and continuously update inventory to meet urgent requirements. Please contact our sales team for current stock and available styles.
- Export Markets: We regularly ship to the USA, Europe, Southeast Asia, South America, and Australia.
Our R&D Team
The R&D team at Tianhong is typically made up of expert technicians and innovation teams that are focused on the advancement of technology and solutions for fabrics.
Tianhong Story
We proudly put our customers' needs first. We are well aware of the wide application of fabrics in different industries, so we focus on providing a variety of fabric options to meet the specific needs of various customers. During the production process, we always maintain strict quality control to ensure that every piece of fabric meets high standards.
About us
