Cotton interlock fabric

Cotton Interlock is a double-knit fabric that is thicker, heavier, and more stable than single jersey. Key indicators of quality include a smooth surface on both sides, excellent shape retention, and a weight typically ranging from 180 to 300 GSM (grams per square meter). For B2B buyers, it is essential to verify the yarn count (e.g., 30s or 40s combed cotton) to ensure a soft hand-feel and reduced pilling.

To ensure market access and consumer safety, prioritize suppliers with OEKO-TEX® Standard 100 certification, which guarantees the fabric is free from harmful substances. If you are targeting the eco-friendly market, look for GOTS (Global Organic Textile Standard) or GRS (Global Recycled Standard). For US-bound shipments, ensure the fabric meets CPSIA requirements for lead and phthalate content, especially if used for children's apparel.

Request a pre-production sample (PPS) and conduct tests for colorfastness to washing and light (aim for Grade 4 or higher). You should also check the shrinkage rate, which for high-quality interlock should be less than 5%. Additionally, evaluate the bursting strength and pilling resistance (ISO 12945-2) to ensure the fabric maintains its integrity after repeated wear and industrial laundering.

Due to its natural stretch and opacity, it is the preferred choice for infant wear, high-end T-shirts, loungewear, and sportswear. Its double-knit structure makes it ideal for printing and embroidery, as the fabric does not curl at the edges, providing a stable base for complex branding designs.

Color consistency is a major risk in textile sourcing. Always require the supplier to provide Lab Dips for approval before dyeing. Ensure the contract specifies that the bulk production must match the approved sample within a Delta E < 1.0 range. For very large orders, insist that all fabric comes from the same dye lot to avoid visible differences between rolls.

Focus on Total Cost of Ownership (TCO) rather than just the price per meter. Negotiate based on volume-based pricing tiers; for instance, increasing an order from 500kg to 1,000kg can often yield a 10-15% discount. Use Made-in-China.com to compare verified suppliers and leverage their Audit Reports to verify the factory's actual production capacity and machinery quality.

Never send full payments upfront. Utilize Secured Trading Services or Letters of Credit (L/C) for large transactions. A standard industry practice is a 30% deposit and 70% balance payment after a successful third-party pre-shipment inspection (PSI). This ensures the goods meet your specifications before the final funds are released.

For bulk fabric, Sea Freight (FCL or LCL) is the most economical choice due to the weight and volume of the rolls. Ensure the supplier uses heavy-duty plastic wrapping and woven bags to prevent moisture damage during transit. For urgent sampling or small boutique orders, Air Freight is viable but significantly more expensive. Always clarify the Incoterms (e.g., FOB or CIF) to understand exactly where your liability begins.