| 1 | Digital Printing Capability | Ability to print detailed artwork on the selected sock construction, including cotton-rich, polyester, nylon, or blended substrates. | Production samples, artwork files, stated printing process, wash-test samples, and documented limitations for dark or highly elastic fabrics. | The supplier must confirm the compatible fiber content, print method, artwork size limits, minimum order quantity, and expected color variation before sampling. | High |
| 2 | Color Fastness to Washing | Printed colors should resist unacceptable fading, staining, or transfer during laundering. | A laboratory report identifying the applicable ISO 105 washing method, test conditions, fabric composition, print recipe, and rating scale. | The report should use a recognized ISO 105 method appropriate to the product. Set a purchase-specific minimum rating, commonly Grade 4 or above for color change and staining where commercially appropriate. | High |
| 3 | Rubbing and Perspiration Fastness | The print should show controlled color transfer under dry rubbing, wet rubbing, and perspiration exposure. | ISO 105 test reports covering rubbing and perspiration, with separate dry and wet results where applicable. | Results should meet the buyer's end-use specification and should be reviewed separately for light-colored garments, dark prints, and high-contact areas such as toes and heels. | High |
| 4 | OEKO-TEX STANDARD 100 | The finished sock or relevant certified component should be tested for harmful substances under the applicable OEKO-TEX product class. | A current certificate number, certificate scope, product class, covered components, issuing institute, validity date, and verification result from the official certificate system. | The certificate must cover the actual finished product or all relevant components, including yarns, dyes, prints, elastics, labels, and sewing materials where applicable. A supplier declaration alone is insufficient. | High |
| 5 | U.S. CPSIA Compliance | Products intended for children in the United States must comply with applicable limits for lead, specified phthalates, and other regulated substances. | Children's Product Certificate where required, third-party laboratory reports, component test records, tracking-label information, and test data linked to the production batch. | For applicable children's products, accessible components must meet the current U.S. lead limit of 100 ppm, and regulated phthalates must not exceed 0.1% in applicable accessible plasticized components. Confirm the latest CPSC requirements before shipment. | High |
| 6 | Fiber and Material Verification | The stated fiber composition, yarn count, elastic content, and material construction should match the approved specification. | Technical data sheet, raw-material declarations, fiber-composition test, yarn specifications, approved pre-production sample, and batch inspection records. | Composition should comply with the destination-market labeling rules and the agreed purchase specification. Any recycled or organic claim should be supported by a valid chain-of-custody document where required. | High |
| 7 | Dimensional Stability and Fit | Socks should maintain acceptable length, width, stretch, cuff recovery, and overall fit after washing. | Pre-wash and post-wash measurements, laundering method, shrinkage calculation, size chart, stretch-recovery results, and sample approval record. | Agree measurable tolerances before bulk production. The tolerance should cover length, foot width, cuff opening, logo placement, and print distortion after washing. | High |
| 8 | Quality Control and Traceability | The production system should identify raw materials, print batches, knitting lots, inspection results, and corrective actions. | Quality manual, inspection checklist, in-line and final inspection records, lot coding, nonconformity reports, corrective-action records, and retention-sample policy. | Every shipment should be traceable to a production lot, approved artwork, material batch, inspection result, and packing record. | High |
| 9 | Packaging and Label Compliance | Packaging, fiber labels, care instructions, country-of-origin markings, and children's-product information should match destination-market requirements. | Pre-production packaging artwork, label artwork, care-label specification, carton markings, barcode details, and destination-country compliance review. | No bulk packaging should be produced until the buyer approves the final artwork and verifies the labeling requirements for each target market. | Medium |
| 10 | Incoterms 2020 and Shipment Risk | The quotation should state the selected Incoterms 2020 rule, named place, transfer point, freight responsibility, insurance responsibility, customs obligations, and delivery schedule. | Commercial invoice, quotation, pro forma invoice, purchase contract, packing list, agreed Incoterms rule, named place, freight quotation, and export-document checklist. | The contract should use a complete formulation such as “FCA [named place], Incoterms 2020” or “DAP [named place], Incoterms 2020.” Do not treat Incoterms as a product-quality certification; they allocate delivery responsibilities, costs, and risk. | High |