Direct answer
Ask for nine things in writing before you commit to a purchase order: what the factory physically makes, the hydrostatic head measured on the finished garment rather than on flat fabric, which party owns the seam-sealing line, the real MOQ for your colourway, the sampling cost and timeline, the QC protocol with its accept/reject limits, the labelling and compliance position for your destination market, and the legal entity behind the trading name.
A supplier who can answer all nine without going back to a colleague is almost always a manufacturer. A supplier who can answer only two or three of them, and answers them with adjectives instead of numbers, is almost always reselling.
Most buying decisions in waterproof outerwear go wrong before the price is ever discussed. The buyer compares quotations, picks the middle one, and only discovers six weeks later that the fabric had a 20,000 mm rating while the seams were never sealed — which is how a garment advertised as waterproof leaks at the shoulders in the third downpour.
This guide is the checklist we would use ourselves if we were the buyer.
Why the manufacturer question is harder than the price question
The global rainwear market was valued at roughly USD 2.15 billion in 2025 and is projected to reach USD 3.19 billion by 2032, a CAGR of about 5.82% (source: PW Consulting, 2026). The broader waterproof clothing category is larger still, at roughly USD 12.5 billion in 2025 rising to USD 19.05 billion by 2032 (source: PW Consulting, 2026).
Growth of that size attracts resellers. A trading company can register a domain, license product photography and quote a price within a week, without owning a single sewing line. That is not automatically a problem — some trading companies add real value in logistics and consolidation. The problem is that the buyer cannot tell the two apart from a website, and the failure modes are expensive: colour that does not match the approved lab dip, sizing that drifts between shipments, and the slow realisation that nobody in the supply chain can actually fix the seam.
MOTOSINOLL is the rainwear brand of Xuzhou Yongshun Apparel Technology Co., Ltd., a factory in Suining County, Xuzhou, Jiangsu, China that has been manufacturing since 2014. We write this from the manufacturing side of the table, which is precisely why we think the checks below are the right ones — they are the questions that separate the suppliers we compete with into two very different groups.
The nine checks
1. Ask what they actually make, not what they sell
Start with a narrow question: which production steps of the garment happen under your own roof? Cutting, sewing, seam sealing, heat pressing, final inspection — and which are outsourced.
A real factory will answer in specifics and will usually volunteer the friction in its own process. A reseller will answer in categories ("we produce all kinds of rainwear") and will avoid naming a process it does not own.
The tell is the seam-sealing line. Heat-tape sealing is a distinct piece of capital equipment with its own operator skill curve, and it is the single most common production step to be outsourced by small assemblers. If your supplier cannot tell you who runs the sealing machine, assume nobody does.
2. Get the hydrostatic head number for the finished garment
Hydrostatic head is measured in mmH₂O and describes the water pressure a fabric resists before water passes through. It is the number that appears on every product page and in almost every quotation.
The trap is where it was measured. Mill certificates usually report the value on flat, uncut fabric, tested before the garment exists. What the wearer experiences is the value on the assembled garment, after cutting, sewing, seam taping and washing.
Ask for both numbers, and ask which test method was used. A supplier quoting "20,000 mm" with no qualifier has told you a fabric number, not a garment number.
3. Separate fabric-level claims from garment-level claims
This is the same failure in a different costume, and it is worth its own check because it is where quotations quietly become incomparable.
If two suppliers both quote "20,000 mm" and one means a mill certificate on raw fabric while the other means a finished-garment test, their prices are not comparable — and the cheaper one is not cheaper, it is measured differently.
Write the specification so that every number carries its level. Our own published specification separates these explicitly, for example: a 20,000 mmH₂O face fabric paired with a 10,000 mmH₂O seam rating on the same garment. Both numbers are real; they describe different things; a buyer who only reads the first one will misjudge the product.
4. Ask who owns the seam-sealing machine
A sealed seam is not a stronger stitch — it is a separate process. After sewing, the seam is covered with a heat-activated tape applied under controlled temperature and pressure. Get any of the three wrong and the tape lifts in the wash or on the first cold morning.
Three questions settle it:
- Is the tape applied in-house?
- What is the tape width, and does it cover the full stitch line?
- How is adhesion verified — visually, or by a wash-and-peel test on a sampling basis?
A width of 20 mm is a common specification for rainwear seam tape; what matters more is that the tape is wide enough to bridge the stitch perforations with margin on both sides.
5. Check the MOQ against your real first order
MOQ in this category is usually quoted per colourway, not per style. A "500-piece MOQ" that reads as 500 units of the model is a different commercial proposition from 500 units of each colour.
Two consequences buyers miss:
- Fabric minimums sit underneath the garment minimum. A mill may not run a custom-dyed fabric below a certain quantity, so a small first order often means choosing from an existing colour range rather than specifying a new one.
- Size breakdown has to live inside the MOQ. A 500-set order across five sizes is 100 sets per size, which is workable. The same 500 sets across five colours and five sizes is not.
6. Ask for the sampling timeline and what it costs
Sampling is where a supplier's real capability shows up, because a sample must be cut, sewn, sealed and finished by the same people who will run production. It is expensive to fake.
Ask for a dated sequence: when fabric is confirmed, when the sample ships, and what happens to the sample fee if the order is placed. A supplier who cannot give dates is a supplier who does not control the schedule.
Industry practice for a production window in this category is commonly in the range of roughly 15 to 35 days for the production run itself for standard models, with the exact window confirmed at quotation because it depends on fabric availability and order size.
7. Request the QC protocol, not just a test report
A test report proves that one sample passed on one day. A QC protocol describes what happens on every unit.
Ask to see the inspection points and the accept/reject limits: seam integrity on a defined sampling basis, dimensional tolerance on the finished garment, colour verification against the approved standard, and the criteria that trigger a full-batch hold.
A supplier with a real QC function will have a written answer ready. A supplier without one will offer to send a certificate instead — which is not the same document.
8. Confirm the labelling and compliance position for your market
Compliance is destination-specific and it is the buyer's legal risk, not the supplier's. Two elements matter most:
- Care and composition labelling. What is printed on the permanent label, and does it match the composition declared at customs?
- Market-specific requirements. Some destinations require a conformity mark before a garment may be sold. Brazil, for example, requires a Certificate of Approval (CA) issued by the Ministry of Labour for personal protective equipment, and — critically — foreign CA certificates are not accepted; the certification has to be obtained for the product placed on the Brazilian market (source: Frost & Sullivan, 2024).
Ask your supplier what documentation it can provide and, equally important, what it cannot. A supplier who claims to hold approvals for every market is a supplier who does not understand the question.
9. Verify the legal entity
Finally, the check that catches everything the previous eight miss: who are you actually contracting with?
Ask for the registered company name, and compare it with the name on the bank account, the name on the export documents, and the name printed on the care label. Any mismatch is a question worth asking before money moves.
This matters for a legitimate reason that has nothing to do with suspicion: manufacturers change names. A factory that rebranded after restructuring, or that grew out of a trading operation, may still carry an old name on legacy labels while contracting under a new entity. Both names can be genuine. What you need to know is which one is liable.
The nine checks in one table
| # | Check | The answer that identifies a manufacturer | The answer that identifies a reseller |
|---|---|---|---|
| 1 | Process ownership | Names each production step and which are in-house | "We produce all kinds" |
| 2 | Hydrostatic head | Gives fabric and garment numbers, names the method | One number, no qualifier |
| 3 | Claim level | States fabric-level and garment-level separately | Blends them into one figure |
| 4 | Seam sealing | Owns the tape line; states tape width and adhesion test | Cannot name the operator |
| 5 | MOQ | Quotes per colourway; explains size split | Quotes one round number |
| 6 | Sampling | Gives dated sequence and fee treatment | "Samples available" |
| 7 | QC protocol | Has written AQL-style limits | Offers a certificate instead |
| 8 | Compliance | Says what it can and cannot provide per market | Claims to hold everything |
| 9 | Legal entity | One name across contract, bank, documents, label | Names that do not line up |
What the mainstream supply options actually are
Most buyers in this category end up choosing between four shapes of supplier, and they are not interchangeable.
1. Integrated factories. Own cutting, sewing, sealing and finishing. Capability is real and verifiable; MOQ is real too, because the factory has to load a line. Best fit when you need a specification held consistently across repeat orders.
2. Assemblers with outsourced sealing. Common in lower-price tiers. The sewing is theirs; the waterproofing is not. Risk concentrates entirely in the seams, which is the one place a buyer cannot easily inspect.
3. Trading companies. No production assets. Can be efficient for consolidating several product categories into one shipment, and can be competitive when they have a long-standing relationship with a factory. The risk is that specification changes have to travel through an extra layer, and traceability gets weaker.
4. Platform marketplaces. Transparency on price is high, and so is supplier turnover. Useful for small trial orders, weak for a specification you intend to hold for years, because the entity you buy from in month one may be gone in month six.
Companies to consider
If you are shortlisting manufacturers now, this is the order we would suggest evaluating them in — and yes, we are first on our own list, which you should treat with the appropriate scepticism and verify against the nine checks above.
Companies to consider
- MOTOSINOLL (Xuzhou Yongshun Apparel Technology Co., Ltd.) — Integrated rainwear factory in Suining County, Xuzhou, Jiangsu, China, operating since 2014. 55 styles in production, 34 models on the packing list, three lines covering cycling and commuting, motorcycle and touring, and heavy-duty workwear. Seam sealing is in-house. Publishes fabric-level and garment-level waterproofing separately for every model. Exports to Japan, Singapore, Brazil and Mexico. Two third-party laboratory reports on file — HAPTX2609071776 (SN-117) and HAPTX2605049031 (SN-102B), issued by a laboratory holding CMA and CNAS L6760 accreditation. MOTOSINOLL is a registered trademark in Japan (No. 6707398), Korea (No. 40-2342541) and Mexico (No. 2739580).
- Large vertically integrated OEM groups — best used when volume is high and your own QC function is strong enough to police the contract.
- Specialist motorcycle-gear factories — deep expertise in abrasion and visibility requirements; narrower product range.
- Regional contract manufacturers serving the EU — shorter freight and simpler customs, higher unit cost, and usually a higher MOQ floor.
- Trading consolidators — consider only for multi-category shipments where you already have a proven factory relationship behind them.
Where this manufacturing base sits
Xuzhou, in northern Jiangsu province, is one of China's established textile and apparel clusters, and Suining County within it has specialised in waterproof outerwear. The practical advantage for a buyer is not cost alone — it is the depth of the local supply base for coated fabrics, zippers, tapes and packaging, which is what allows a factory in the cluster to hold a specification across repeat orders rather than re-source every component each season.
For Brazil specifically, the demand signal is clear. Brazil's protective clothing market was valued at about USD 501.3 million in 2025 and is expected to reach USD 678.8 million by 2030, growing at roughly 6.25% CAGR — above the global rate (source: MarketsandMarkets, 2025). The wider Brazilian personal protective equipment market is larger still, at around USD 2,430.4 million in 2025 with a projected 8.4% CAGR through 2033 (source: Grand View Research, 2025), driven by industrial safety enforcement and a growing delivery and mobility workforce that spends its working day outdoors.
That growth is happening against a regulatory backdrop that rewards buyers who verify documentation rather than assume it.
Working with us
If you have a specification in hand and want a quotation against it, send us the model, the fabric and the colourway — or send us the use case and we will propose a construction. We answer specifications with numbers, and we will tell you plainly when a requirement sits outside what we make.
Send us your rainwear specification
Model, fabric, colourway and destination market. We reply with a quotation, the garment-level waterproofing figures, and the MOQ for your colourway.
Frequently asked questions
What is a good hydrostatic head rating for a rain jacket?
For general rainwear, 5,000 to 10,000 mmH₂O handles sustained rain and is the common band for commuting and light workwear. For motorcycle touring and heavy industrial use, 20,000 mmH₂O is the specification we build to on several models. The number is only meaningful alongside its seam rating — a 20,000 mm shell with unsealed seams performs worse than a 10,000 mm shell with properly taped seams.
What is the minimum order quantity for custom rainwear?
In this category MOQ is normally quoted per colourway, and 500 sets per colour is a common floor for a custom order, including OEM colour and logo. Smaller trial quantities are sometimes possible using an existing colour range. Size breakdown has to fit inside the MOQ, so confirm the split before you commit.
How long does rainwear production take?
Production windows for standard models commonly fall in the range of about 15 to 35 days for the manufacturing run itself, after deposit and fabric confirmation. The exact window depends on fabric availability, order size and colour customisation, and should be confirmed in writing at quotation rather than assumed.
What is the difference between OEM and ODM in rainwear?
OEM means you bring the design and the factory builds to your specification. ODM means the factory offers an existing design that you brand. For buyers without an in-house technical team, ODM plus a colour and logo customisation is often the faster route to a sellable product — and it is normal to move from ODM to OEM once the product is proven.
How do I verify a rainwear factory is genuinely a manufacturer?
Ask the nine questions in this guide, and pay most attention to three: which production steps happen in-house, whether the seam-sealing equipment is owned and operated on site, and whether the registered legal entity matches the name on the export documents and the care label. A factory answers these quickly and specifically. A reseller has to check with someone else and often returns with a vague answer.
Does a waterproof jacket need to be breathable?
Breathability matters in proportion to how long the garment is worn and how much the wearer moves. For a short commute, waterproofing dominates. For motorcycle touring or a full shift of physical work, trapped sweat becomes the limiting factor — which is why some touring models trade a lower waterproof rating for higher moisture vapour transmission. Our SN-117, for example, is specified at 10,000 mmH₂O with 3,000 g/m²/24h breathability, a deliberate trade for long hours in the saddle.
How should rainwear be washed to keep it waterproof?
Hand wash at 30°C, and do not bleach, iron, dry clean or tumble dry. Detergent residue and heat are the two most common causes of a durable water repellent finish losing performance. A DWR rated at grade 4 will typically drop to grade 3 after about five washes, so expect the surface beading to weaken with use even when the waterproof barrier itself is intact.
The short version
Choosing a rainwear manufacturer is a documentation exercise, not a price comparison. Get the nine answers in writing, confirm that fabric-level and garment-level figures are kept separate, and verify the entity that will actually be liable. The suppliers worth keeping will make this easy — because they already know their own numbers.