Who this checklist is for (and the one thing it won't do)

I manage the eyewear sourcing budget at a 90-person accessories importer. I've owned that budget (around $1.4M annually) for six years, negotiated with 30+ factories and trading agents, and logged every purchase order in our cost tracking system since 2019. Most of that money now sits in a single frame shape: rectangles. Women's rectangle sunglasses, men's rectangle sunglasses, black, tortoise, crystal, polarized and not.

This is the exact seven-step checklist I run before any bulk order. No skipping steps. It works for wholesalers, independent retailers adding a private label, and small brands trying to get a first production run out the door without lighting money on fire.

What it won't do: it won't tell you which factory to use. "Best" is highly context-dependent, and any sourcing agent claiming otherwise is selling you something. What it will do is stop you from paying twice for the same lesson.

The 7-step rectangle sunglasses sourcing checklist

Step 1: Lock the frame spec before anyone quotes a price

Every sourcing problem I've had started with a spec I assumed was obvious. Lens width, bridge width, temple length, total frame width, frame height, material (acetate vs. injection), hinge type, lens base curve, lens tint, and the logo placement—those are the minimum.

Here's the one that still stings. "Same as last time"—I said it. They heard "close enough to last time." Result: temple width off by roughly 4mm, which doesn't sound like much until the frame slides off every wearer's face and your returns rate triples.

Checkpoint: A written spec sheet (dimensions in mm, materials named, finish listed) signed off by you and sent identically to every factory you're quoting. If two factories receive two different versions, that's on you.

Step 2: Order samples from at least two factories, and actually wear them for a week

Samples tell you three things a spec sheet can't: whether the hinge feels cheap in the hand, whether the temple tips dig into your ear, and whether the frame sits flat on a table. That last one sounds trivial (it isn't). A frame that rocks on a flat surface is a frame that will rock on a retail shelf.

I didn't fully understand how much this mattered until a $3,000 first order came back with a hinge that creaked audibly when opened. Every customer noticed. None of them said "the hinge is bad"—they just returned the product.

Checkpoint: Two samples, minimum, worn for five business days each. Written notes on hinge feel, weight, and lens clarity.

Step 3: Build a TCO spreadsheet, not a unit-price comparison

This is the step most buyers skip, and it's the one that decides whether you actually made money on the order. Unit price on a rectangle frame can look like $2.10 from Factory A and $1.85 from Factory B—and Factory B ends up costing you 30% more by the time you've paid for everything A bundled in.

The hidden line items to load into your total cost of ownership model:

  • Mold / injection tooling (one-time on custom frames)
  • Temple logo printing or lens etching (almost always quoted separately)
  • Lens coating (UV, AR, mirror—each is a line item)
  • Packaging (case, pouch, hangtag, barcode sticker)
  • Freight, insurance, and import duties
  • QC redo allowance (% of units you expect to reject)
  • Payment terms / FX exposure if you're paying in RMB

It took me about four years and 200-odd POs to internalize that unit price is a vanity metric. Total landed cost per sellable unit is the number that goes on your board slide.

Checkpoint: A TCO number for every quote, with the assumptions listed. If a factory quote doesn't break out tooling and packaging, ask for it in writing.

Step 4: Get UV and impact-resistance claims in writing, with the test method named

This is the step I'd bet most buyers still skip. What most people don't realize is that "UV400" is often a marketing label on a box, not a tested spec. Unless the factory sends you a lab report that references the actual test method, you're taking their word for it.

In the US, sunglasses are regulated as Class I medical devices, and under FDA regulation 21 CFR 801.410 the lenses are expected to be impact-resistant (the drop-ball test is the standard method). Advertiser claims about UV protection, polarization, and "blocking 100% of UVA/UVB" also need substantiation—the FTC's advertising guidance is clear that unsubstantiated health or safety claims are treated as deceptive.

What that means in practice: ask for the test report, read the method column, and keep the PDF. If the factory can't produce one, price that risk into your decision.

Checkpoint: A one-page PDF per SKU, from a named lab, referencing the test method (FDA 21 CFR 801.410 for impact; ANSI Z80.3 for UV category). Filed before you approve production.

Step 5: Test black frames under daylight before you sign off on production

Black rectangle sunglasses are the highest-volume SKU in most catalogues and the most likely to arrive in a color you didn't order. A failed reorder in spring 2023 changed how I handle black frames—half a shipment read as dark brown in daylight, same Pantone reference, different dye lot at the acetate supplier.

Black acetate is notoriously sensitive to lot variation. It'll look black under warehouse lighting and grey-brown under a shop window. Ask the factory for the lot number on the production run, then request photos taken in daylight (not studio, not flash) before you approve the balance payment.

Checkpoint: Daylight photos of the actual production lot, plus the dye lot number on the invoice.

Step 6: Negotiate MOQ, reorder terms, and the mold ownership question

The first quote is rarely the final price. That's not a trick—it's just how the relationship works. Once you've proven you're a reliable repeat buyer, there's usually room on reorder pricing, packing list flexibility, and payment terms.

The reorder terms usually get missed. Ask explicitly: who owns the mold or tooling if you paid for it? What's the agreed MOQ for a reorder in the same colorway versus a new color? How long is the price held (30 days? 90?) before a raw material adjustment? Get each answer on the PO, not in the chat thread.

I paid for a mold in 2021 that was "owned by the factory" because I never asked. When we moved to a second factory for a backup run, we paid for that same mold twice.

Checkpoint: All commercial terms (MOQ by SKU, price hold period, tooling ownership, payment schedule) printed on the PO. If it's not on the PO, it doesn't exist.

Step 7: Plan your reorder cycle around the factory's production calendar

If I remember correctly, our lead time on a repeat rectangle order runs about 35 to 45 days door to door—closer to 60 when we count the sample revision cycle at the front end. Chinese New Year alone can add 2–4 weeks on either side of the holiday, and the mid-autumn and October Golden Week breaks quietly eat calendar days too.

The trick isn't to ask the factory to work faster. It's to place the reorder before their production queue gets locked by the seasonal rush—usually 8 to 10 weeks ahead of your in-store date, not 5.

Checkpoint: Reorder placed at the 8-10 week mark, with a written confirmation of the ship date and the tooling slot reserved for your MOQ.

Common mistakes I still see (and occasionally still make)

The cheapest frame isn't the cheapest order. Factory B's $1.85 quote becomes the expensive one the moment you pay for hinge rework, packaging you assumed was included, and freight on the replacement batch.

"Standard turnaround" is a range, not a promise. It usually includes buffer time the factory uses to manage their own production queue. It's not necessarily how long your specific order takes.

Verbal UV claims don't survive a customs inspection. If your marketing says the lenses block 100% of UVA/UVB, you need the substantiating test report in your records. The FTC isn't shy about this one.

The sample looks like the bulk order—usually. These days I send daylight photographs of the approved sample back to the factory with the production PO. It's a small extra step and it's saved me three redo conversations in two years.

Seven steps, run in order, every order. That's the whole process. What was best practice in 2020—phone the agent, get a quote, place the order—doesn't hold up in 2025. The fundamentals (clear specs, samples, landed cost) haven't changed, but the execution needs to be documented, in writing, every single time.