Build a Sunglasses Spec Sheet That Prevents Quote Drift

If you buy sunglasses from overseas factories, the spec sheet is where quote drift usually starts. A vague RFQ can produce a low first price and extra costs later when the supplier makes different assumptions about materials, lenses, tolerances, decoration, packaging, or compliance. This guide shows brands, importers, distributors, and retailers which fields to lock before requesting a quote, so factories price the same product instead of their own version of it. It also shows where LumiShades' in-house processes fit: injection molding, acetate cutting, CNC milling, tinting, decoration, and QC.

Start With the Use Case

Before you ask for a quote, define how the sunglasses will be sold and used. A promo pair, a retail style, and a polarized outdoor frame do not share the same cost structure. Skip this step and the factory fills in the blanks.

Put these fields at the top of the spec sheet:

• Target market: retail, promotional, sport, children, or private label.
• End use: general fashion, UV protection, glare reduction, or driving.
• Sales channel: online, chain retail, wholesale, or giveaway.
• Annual forecast: trial order, repeat program, or rolling stock.

That block tells the supplier which process to quote. Injection-molded frames usually price differently from acetate frames cut and polished in a more manual flow. If you already know the construction, say it plainly. Do not write "same as sample" unless the sample is approved and tied to a signed spec sheet.

Lock the Frame Build First

The frame section is where many quotes drift. "TR90 frame" or "acetate frame" is not enough. The supplier still needs the exact build. List the material, temple style, hinge type, finish, and size limits. If you want a molded frame, say so. If you want acetate with CNC shaping, say that too. The process changes labor, yield, and price.

If the design uses metal logo plates, laser engraving, or pad printing, state the exact location and size. If the frame is acetate, include the color pattern too. Tortoiseshell is not one color. "Black-brown mix" is still too vague for repeat production. Use a reference sample or a Pantone target if you have one. If the factory has to guess, you pay for correction rounds.

Define Lens Specs in Plain Numbers

Lenses are where compliance and quote drift meet. Specify lens material, tint, tint category, lens thickness if relevant, polarization status, mirror finish, and UV requirement. Do not write "UV400" and stop there. Say whether you need basic sun protection, polarized lenses, or a fashion tint only. If the style will be sold in a market with stricter testing, say so upfront.

Use concrete fields like these:

1. Lens material: PC, CR-39, TAC, or glass if truly needed.
2. Tint: solid, gradient, smoked, mirrored, or polarized.
3. Lens color code: grey, brown, green, blue, or custom.
4. Optical target: fashion, driving, sport, or kids.
5. Required standards: CE EN ISO 12312-1, ANSI Z80.3, or AS/NZS 1067, if applicable.

If you want a brown lens with a medium tint on one run and a darker tint on the next, those are not the same quote. Set the tint band you will accept. Otherwise, the factory may deliver a legal product that still fails your batch-to-batch expectations.

Set Dimensions and Tolerances

Size drives fit, and fit drives returns. Many RFQs list lens width and temple length but forget bridge width, frame front width, and frame height. That is not enough. A pair can look right on paper and still wear badly. If you are buying for multiple regions, keep the spec sheet precise.

Include these fields:

• Lens width, bridge width, temple length, frame height, and front width.
• Allowed tolerance on each critical dimension, usually in mm.
• Weight target if the style is meant to feel light.
• Face-fit notes: narrow fit, medium fit, wide fit, or kids sizing.

Be explicit about tolerances. A loose ±0.5 mm may be fine for some fashion styles, but tighter control may be needed for lens seating or hinge alignment. If you do not state tolerances, the supplier quotes to its own internal standard. That standard may not match your fit or return tolerance. Cheap quotes go bad here. The sample passes, then the bulk run comes back with enough variation to create rework.

Specify Decoration and Finish

Decoration affects cost and scrap. A clear spec sheet names the method, artwork file format, placement, and color count. If your logo is laser engraved, say whether you need a shallow mark or a deeper etched look. If you want pad printing, list the Pantone reference and how many colors. If you want a metal logo plate, state the shape, finish, and attachment method.

For every decoration method, answer four questions:

• What is the method: laser engraving, pad printing, metal plate, or embossing?
• Where does it go: temple outside, inside arm, lens corner, or bridge?
• How many colors or layers?
• What is the acceptable wear standard after handling and normal use?

Decoration is never free. Each extra color or secondary process adds labor and risk. If a quote does not show the decoration method clearly, the supplier may price a simpler version and then add cost once artwork is finalized.

Use a Real Compliance Block

Do not write "must be compliant" and leave it there. A serious supplier needs to know the destination market and the standard used to judge the product. Compliance affects materials, lens performance, labeling, and test planning.

Put a dedicated compliance block on the spec sheet. Include only the standards you actually need. The standards commonly referenced for sunglasses programs include CE EN ISO 12312-1, ANSI Z80.3, AS/NZS 1067, REACH, FDA registration, ISO 9001, and BSCI. Do not ask for a standard you do not plan to use, and do not mix market standards with factory certifications as if they were the same thing.

If your team does not know which standard applies, state the destination market and ask the factory to quote only against that. Otherwise you compare two quotes that are built to different targets.

Put Commercial Terms on the Sheet

Quote drift often starts after the first price. The supplier quotes one tier, then the buyer changes quantity, packaging, lens type, or decoration and wonders why the unit cost moved. Put the commercial assumptions in the spec sheet so nobody can claim they were unclear.

For LumiShades, state the commercial setup only as provided for the project quote: MOQ, volume tiers, sample lead time, and bulk lead time. If your project includes different quantities or packaging, ask the supplier to quote each version separately. Do not assume one price covers a different configuration.

• State the order quantity at each tier you want quoted.
• State whether packaging is bulk-packed, polybagged, boxed, or retail-ready.
• State whether color mixes are allowed inside the same order.
• State whether the quote includes tooling, sample, and artwork charges.

Ask for a line-item quote if the program may grow. A good supplier will show how frame, lens, decoration, and packaging change at each volume band. That is how you avoid a low quote that quietly omits real costs.

Package the RFQ So Changes Are Traceable

A spec sheet is not enough by itself. The RFQ pack should include a drawing, reference sample photos, a color callout, and a change log. If you revise a temple angle, lens tint, or logo position, write it down. Factories do not remember version history the way your team does.

Use a simple control pack:

1. Approved drawing with version number.
2. Reference sample or clear photos of the approved style.
3. Material callouts and finish notes.
4. Compliance block and destination market.
5. Packaging and carton instructions.
6. Change log with date and owner.

Once the sample is approved, freeze the spec. If the buyer wants a change after sample approval, treat it as a costed revision. That is normal. It is also where margin gets eaten if nobody tracks it. A clean spec sheet does not prevent every issue, but it gives both sides one document to point to when the order moves from sample to bulk.

Why source this from Wenzhou with LumiShades

Wenzhou in Zhejiang Province is widely regarded as China’s eyewear manufacturing capital, producing a large share of the world’s sunglasses. That concentration matters to buyers: a deep local supply chain for acetate sheet, hinges, lens blanks, plating and packaging means shorter component lead times, easier color and material matching, and a workforce with decades of eyewear-specific skill. LumiShades has manufactured in this ecosystem since 2009, and our vertical integration — in-house injection molding, acetate cutting, CNC milling, lens tinting, decoration and quality control — means no part of your order is quietly subcontracted to a workshop you cannot audit.

For international buyers, that vertical control translates into accountability. When a single factory owns every step, defects are traced and fixed at source rather than bounced between vendors, and your specifications survive intact from first sample to bulk. We back this with 15+ years of experience, shipments to 60+ countries, more than 5 million pairs produced per year and a 98.5% on-time delivery rate. Our certifications — CE EN ISO 12312-1, FDA registration, ANSI Z80.3, AS/NZS 1067, REACH, ISO 9001 and BSCI audit — mean the compliance documentation your market requires already exists. Explore our manufacturing capabilities and quality control process to see how this works in practice.

Frequently asked questions

What is the minimum information a sunglasses spec sheet needs to avoid bad quotes? At minimum, include frame material, lens material, dimensions with tolerances, lens color or tint, decoration method, compliance target, quantity, and packaging. Leave any of those out and the quote will usually rely on assumptions. If the product has special fit, finish, or test requirements, state those too.

Should I include Pantone codes for every color? Yes, if color consistency matters across repeats. If you do not have a Pantone code, use a physical reference sample and write the acceptable color range. "Black" or "brown" alone is too vague for repeat orders, especially when the factory sources different resins or coatings.

How detailed should tolerances be? Give tolerances for the dimensions that affect fit and assembly, not just a general note. Lens width, bridge width, temple length, frame height, and front width should be explicit. If a dimension affects lens seating, hinge alignment, or packaging fit, call out a tighter tolerance before sampling.

Do I need to list compliance standards in the RFQ? Yes. State the destination market and the standards you want quoted against, such as CE EN ISO 12312-1, ANSI Z80.3, AS/NZS 1067, REACH, or FDA registration. Keep market standards separate from factory certifications like ISO 9001 or BSCI, because they answer different questions.

How do I stop a supplier from changing the price after sampling? Freeze the approved spec, keep a versioned change log, and make sure the RFQ shows whether tooling, decoration, packaging, and testing are included. Any post-sample change should be treated as a new costed revision. If the supplier still revises pricing, ask for a line-item breakdown tied to the changed element.