Interlock fabric

Interlock fabric is a double-knit construction that is thicker, heavier, and more stable than single jersey. High-quality interlock should feature identical smooth surfaces on both sides, excellent shape retention, and a high GSM (Grams per Square Meter) typically ranging from 180 to 300g/㎡. Ensure the fabric has a tight knit structure to prevent 'run' or unraveling when cut.

For activewear, prioritize Polyester/Spandex or Nylon/Spandex blends for moisture-wicking and 4-way stretch. For baby clothing or high-end loungewear, 100% Combed Cotton or Bamboo fibers are preferred due to their hypoallergenic properties and breathability. If cost-efficiency is the goal, TC (Polyester-Cotton) blends offer a balance of durability and lower price points.

To ensure market access, verify that the supplier holds OEKO-TEX® Standard 100 certification, which guarantees the fabric is free from harmful substances. For organic lines, GOTS (Global Organic Textile Standard) is mandatory. If exporting to the US, ensure compliance with CPSIA (especially for children's wear), and for the EU, check REACH regulations regarding chemical dyes.

Request a pre-production sample (PPS) and conduct third-party lab tests focusing on Colorfastness to Washing (Grade 4+ recommended), Pilling Resistance (Grade 3-4), and Shrinkage Rate (should be <5%). For interlock specifically, check for bursting strength to ensure the double-knit layers do not separate under tension.

Implement a 'Lab Dip' approval process before mass production. Require the supplier to provide dye lot samples for every batch. Use Made-in-China.com's Inspection Service to conduct on-site checks during production to ensure the GSM and hand-feel match the approved golden sample.

Focus on Total Landed Cost rather than just the FOB price. Negotiate tiered pricing based on volume (e.g., 500kg vs. 2000kg). Ask for customized packaging (e.g., vacuum packing) to reduce shipping volume and protect the fabric from moisture and mildew during long-sea transit.

Ensure the supplier provides an accurate HS Code (typically 6006 for knitted fabrics) to avoid customs delays. For urgent samples, use Air Express (DHL/FedEx), but for bulk, Sea Freight (LCL/FCL) is more economical. Always clarify the Incoterms (FOB or CIF) to define who bears the risk during the main carriage.

Utilize Secured Trading Services provided by Made-in-China.com to protect your payments. Never transfer funds to personal bank accounts; always use verified corporate accounts. Ensure the Sales Confirmation (SC) explicitly states the lead time, compensation clauses for defects, and dispute resolution methods.