Sourcing Guide

Top 5 Questions Before Switching Sock Factories

Published: 2026-07-09By ZheSock TeamReading time: 8 min

Switching sock factories is not a price exercise. It is a controlled handover of yarn, machine settings, artwork, packing rules, inspection standards, and delivery dates. A new supplier can fix late shipments or drifting quality, but only if you test the transfer before a full season order. Use these five questions to check whether a factory can repeat your sock, quote it honestly, and ship it without quiet spec changes. Treat the first order like an RFQ trial. Put every acceptance rule in writing before deposit payment.

Table of Contents

1. 1. Can the New Factory Match Your Current Sock Specs?
2. 2. What MOQ Is Safe for the First Transfer Order?
3. 3. What Lead Time Is Real From Sample to Shipment?
4. 4. Is the Lower Price Real, or Did the Spec Change?
5. 5. How Will Quality Be Checked Before Shipment?
6. 6. What Must Be Ready Before You Leave the Old Factory?

1. Can the New Factory Match Your Current Sock Specs?

Start with the sock, not the unit price. Send one approved bulk sample, the tech pack, artwork files, size chart, packing photos, carton marks, and the last inspection report. Ask the factory to return a spec sheet before it quotes.

The spec sheet should name the yarn composition, yarn count, machine needle count, sock weight in grams, cuff height, leg length, foot length, terry position, logo method, and packaging. Do not accept "same as sample" as the full answer. It is too loose.

Needle count changes the sock. A 144N machine gives a different hand feel and logo result than 168N. A 200N or 240N machine is common for finer dress socks. Heavy terry sports socks often use 96N, 108N, or 120N, depending on yarn thickness. If your current crew sock is 168N and 42 grams per pair, a 144N quote at 36 grams is not the same product.

Foot length acceptance: within 0.5 cm of the approved sample for most casual crew socks.
Cuff height acceptance: within 0.3 cm unless the buyer sets a tighter rule.
Logo position target: within 0.3 cm from the approved sample.
Pair weight check: usually within 3 percent to 5 percent after bulk starts.
Stretch check: record relaxed width and stretched width at cuff, ankle, and foot.
Fabric weight reference: thin dress socks may be near 120 to 180 GSM, while terry sports socks may sit around 250 to 420 GSM.

Ask for a side by side comparison table. One column is your current standard. One column is the new factory proposal. Any change in needle count, yarn, weight, cuff height, logo method, or packing must be approved before sampling.

For the first counter sample, require at least two pairs per size and color. Wash one pair, keep one pair unwashed, then compare shrinkage, twist, shade, hand feel, and logo clarity. Mark the approved pair with date, style code, size, color, and buyer signature or email approval. That pair becomes the production reference.

2. What MOQ Is Safe for the First Transfer Order?

MOQ is a risk decision. A factory may give its best price at 3,000 to 5,000 pairs per style and color, but that is often too much for the first order after switching sock factories. Test one style before moving a full range.

For many custom sock projects, ZheSock can support a 100 pair MOQ during development. That works for fit checks, buyer presentations, market tests, and small launches. The unit price will be higher because setup, programming, yarn handling, boarding, and packing are spread over fewer pairs.

100 to 300 pairs: pilot run, sales test, or sample room order.
500 to 1,000 pairs: practical first order for one design and one colorway.
3,000 to 5,000 pairs: stronger unit price for repeatable production.
10,000 pairs and above: better planning for yarn purchase and machine time.

Ask whether the MOQ is per design, per color, per size, or per shipment. This matters. A 1,000 pair MOQ per color becomes 4,000 pairs if you run four colors. For size sets, confirm whether S, M, L, and XL can share one MOQ or need separate minimums.

Ask about leftover yarn too. Dyed yarn may require 20 kg to 50 kg per color, depending on mill rules. If your order uses only part of that yarn, the balance may stay in the factory warehouse or be charged to you.

Set a pilot order acceptance gate. For example, approve the next order only if the first shipment passes final inspection, carton quantity matches the packing list, barcode scans are correct, and return feedback stays within your normal limit after the first sales cycle. Be direct. A cheap pilot that creates store complaints is not cheap.

There is a commercial trade off. A 300 pair order may cost 20 percent to 60 percent more per pair than a 3,000 pair order, depending on yarn and packing. That premium buys information. You learn how the factory handles files, comments, defects, and deadlines before you place a larger PO.

3. What Lead Time Is Real From Sample to Shipment?

A factory change takes longer than a repeat order. Build the calendar backward from the delivery date. Do not plan from one promised ship date.

For custom socks, a first counter sample usually takes 5 to 10 days after artwork, yarn, size, and packaging details are confirmed. If yarn dyeing is needed, add 7 to 12 days. One revision often adds 3 to 7 days. Two sample rounds can use 14 to 30 days before bulk approval.

Bulk production for standard cotton or polyester socks is often 20 to 35 days after deposit and sample approval. Jacquard logos, full terry, compression zones, gift boxes, or mixed size packs can push production to 35 to 50 days. Peak months can add another 7 to 14 days if machine capacity is tight.

Yarn booking: 2 to 5 days for stock yarn, 7 to 12 days for dyed yarn.
Knitting setup: 1 to 3 days for program check and first piece approval.
Knitting: 3 to 12 days, depending on quantity and machine count.
Linking or toe closing: 2 to 6 days.
Boarding and shaping: 1 to 4 days.
Final inspection and packing: 2 to 5 days.
Export booking and loading: 3 to 7 days after cartons are ready.

Add approval deadlines to the RFQ. State the date for counter sample dispatch, the date for buyer comments, the date for pre production sample approval, and the last date for packing file release. If the buyer holds artwork approval for five days, the shipment date moves. Both sides need to see that.

Freight time belongs in the plan. Air freight usually takes 5 to 10 days after pickup, but the cost can be several times higher than sea freight. Ocean freight often takes 25 to 40 days to the US or Europe, plus customs and local delivery.

Ask the factory to report production progress by stage, not only by percentage. "60 percent finished" can hide unfinished toe closing or unpacked goods. A better update says 8,000 pairs knitted, 6,500 pairs linked, 5,200 pairs boarded, 3,000 pairs packed, with expected carton completion date.

4. Is the Lower Price Real, or Did the Spec Change?

Price comparison must be line by line. A quote at USD 0.42 per pair and a quote at USD 0.58 per pair may describe two different socks. The lower price may use lighter yarn, fewer stitches, a shorter cuff, weaker carton board, or a cheaper logo method.

As a rough export range, basic ankle socks can run USD 0.35 to 0.70 per pair in bulk. Midweight cotton crew socks often sit around USD 0.55 to 1.20. Terry athletic socks with jacquard logos may range from USD 0.90 to 2.20. Compression socks can cost more because knitting speed is slower and size control is stricter.

Ask each factory to quote the same spec: composition, yarn count, needle count, pair weight, size ratio, packaging, carton quantity, incoterm, and payment term. If a supplier cannot state the pair weight in grams, the quote is not ready for comparison.

EXW price excludes local transport, export handling, and port charges.
FOB Ningbo or FOB Shanghai usually includes delivery to port and export handling.
Hangtags, belly bands, polybags, hooks, and insert cards may add USD 0.03 to 0.20 per pair.
Custom boxes can add USD 0.20 to 0.80 per unit, depending on board, print, and quantity.
Sample freight can cost USD 30 to 80 by courier for small parcels.
Barcode stickers, carton labels, and inner case labels should be quoted as separate packing items when they are not standard.

Get photos of the sock inside. Long yarn floats inside jacquard socks can catch toes and cause complaints. Also ask for carton size, gross weight, and pairs per carton. Freight cost can erase a low unit price.

Lock the commercial terms before sampling. State currency, incoterm, payment term, sample fee, mold or programming fee if any, packing cost, inspection cost, and validity period of the quote. Many yarn prices move after 15 to 30 days. If the quote is valid for only two weeks, your RFQ calendar needs to reflect that.

Ask what happens if bulk weight is below the approved sample. A clear rule could be remake, discount, or buyer approval before shipment. Do not leave that discussion until cartons are packed.

5. How Will Quality Be Checked Before Shipment?

A good sample does not prove bulk quality. Socks pass through yarn receipt, knitting, toe closing, boarding, pairing, labeling, carton packing, and final inspection. Defects can enter at each step.

Ask for a written quality plan. It should cover incoming yarn checks, first piece approval on each knitting machine, inline inspection during knitting, needle detection where required, boarding temperature records, size checks after boarding, shade checks under a light box, and final carton inspection.

Incoming yarn: check composition label, lot number, color lot, and yarn condition.
First piece approval: confirm length, width, logo position, terry area, and weight before mass knitting.
Inline check: review broken yarn, dropped stitches, oil stains, loose elastic, and wrong size marks.
Boarding control: record temperature and time, since over boarding can change stretch.
Final inspection: use AQL 2.5 for major defects and AQL 4.0 for minor defects when this fits the buyer standard.
Metal control: use needle detection for programs that require it, then record date, operator, and result.

Common major defects include wrong size, obvious shade mismatch, holes, missing logo elements, sharp foreign matter, and wrong packaging. Minor defects may include small loose threads, light dirt that can be cleaned, or slight label skew within the approved limit.

Set measurable acceptance criteria before bulk starts. Example rules: no holes, no missing logo parts, no mixed sizes in one retail pack, barcode scan rate at 100 percent in the checked sample, carton mark match at 100 percent, and pair weight within the approved tolerance. For shade, approve a color range with one standard sample and one limit sample when possible.

Packing checks need their own line in the inspection plan. Confirm pair folding, left and right sock match, hangtag direction, polybag warning text if used, size sticker, barcode, inner quantity, carton quantity, carton mark, carton dimensions, gross weight, and tape method. Open cartons from different parts of the packed lot, not only the cartons placed near the inspection table.

If you need material claims, state them early. ZheSock can work with OEKO-TEX material options, and some projects may request GOTS or GRS yarn where available. Put the required certificate name, yarn source rule, and document deadline in the purchase order.

6. What Must Be Ready Before You Leave the Old Factory?

Do not break the old supply chain until the new one has passed a real order. First collect every file and physical reference tied to the sock. Missing data causes extra sample rounds, shade errors, and packing mistakes.

Latest tech pack with size chart and tolerances.
Approved bulk sample for each style.
AI or PDF artwork files with Pantone references.
Yarn composition, yarn count, and needle count records.
Wash test notes, shrinkage data, and fit comments.
Barcode files, hangtag files, carton marks, and packing method photos.
Carton dimensions, pairs per carton, net weight, and gross weight.
Past inspection reports and customer complaint records.
Approved sample labels showing style code, color, size, and approval date.
Any retailer packing manual or marketplace carton rule tied to the order.

If you own special labels, molds, packaging stock, or unused yarn, confirm where they are stored and who paid for them. Some suppliers will transfer buyer owned items after open invoices are cleared. Others may charge local freight or handling.

Run one pilot order with the new factory while the old factory covers repeat demand. After the pilot passes fit review, wash testing, shade approval, carton drop checks, and final inspection, move more volume. This staged switch protects stock flow.

Use a formal handover file. It should include the approved sample photos, measurement table, packing layout, barcode list, inspection checklist, and PO terms. Send one version only. File conflicts create mistakes when merchandisers, sample room staff, and packing workers use different documents.

Check cash flow too. A new supplier may ask for 30 percent deposit and 70 percent before shipment. If your current supplier gives 30 day or 60 day credit, switching sock factories can tie up cash for one to two months.

Keep one exit control. Do not cancel all old factory orders until the new factory has shipped cartons that match the approved sample and packing rules. The safest switch is boring. It has dates, photos, signed approvals, and inspection records.

Frequently Asked Questions

When should I start switching sock factories?

Start 60 to 90 days before the next bulk delivery date. That allows time for counter samples, one revision, deposit payment, production, inspection, and freight booking. If dyed yarn, gift boxes, or compression sizing are involved, allow 90 to 120 days. Keep the current supplier on repeat items and test the new sock factory on one lower risk style first.

Can a new sock factory copy my current sample exactly?

It can usually get close, but exact matching depends on yarn count, needle count, stitch density, boarding mold, and washing process. Send one approved sample and require a written counter sample sheet. Compare pair weight, foot length, cuff height, stretch, logo position, and shade before approval. Keep one approved sample at the factory and one in your office.

What MOQ should I expect from a custom sock factory?

Many factories prefer 500 to 1,000 pairs per design for normal custom sock orders. Better pricing often starts at 3,000 to 5,000 pairs per style and color. For testing, ask whether 100 to 300 pairs are possible. The unit price will be higher, but the order risk is much lower. Confirm whether the MOQ applies by design, color, size, or shipment.

How do I compare two sock factory quotes fairly?

Ask both factories to quote the same yarn composition, yarn count, needle count, pair weight, logo method, size ratio, packaging, carton quantity, incoterm, and payment term. Then compare the price. If one quote is much lower, request the sock weight in grams, inside photos, carton size, and gross weight. The difference is often visible there.

What documents should I send before sampling?

Send the tech pack, AI or PDF artwork, Pantone colors, size chart, material target, packing files, barcode rules, carton marks, and one physical approved sample if available. Add any required material request, such as OEKO-TEX, GOTS, or GRS, before the factory sources yarn. Also send your acceptance tolerances for size, weight, logo position, shade, and packing.

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