Sep 14, 2026Manufacturing & Capabilities
Compression Sock Compliance for Importers: mmHg Thresholds, Test Reports and What to Ask Your Factory
Compression sock compliance is not one certificate. Here is how to position a product by mmHg, read a test report, file the right documents and verify what your factory claims.
Direct answer (the short version). Compression sock compliance is not a single certificate you collect — it is three things you can verify. First, position the product by intended use and pressure class in mmHg, because that positioning usually decides which regulatory path applies. Second, obtain a test report that actually names your product, size and construction, instead of a supplier saying "we test it." Third, put your verification questions in writing and keep the answers on file. If you have not chosen a supplier yet, work through how to choose a custom compression sock manufacturer first — this article assumes the product is defined and deals with the paperwork.
Scope and disclaimer. Everything below about mmHg thresholds, FDA pathways, EU MDR and classification is general industry education, not legal advice, and is not a statement about Aby-Tex's certifications or registrations. Thresholds, clauses and classifications change and are unverified for publication — check them against the current FDA and EU rules (and a qualified advisor) before you rely on them, label a product, or publish anything based on them.
1. Position first, then talk documents: intended use and pressure class (mmHg)
You cannot know which documents matter until you know what the product is claiming to be. Two questions come before any document request:
What is it for? A product presented for a therapeutic or medical use and a product presented for general comfort or wellness are not on the same regulatory footing.
What pressure class does it deliver? The compression range, stated in mmHg, is usually the single number that drives the rest of the conversation.
Answering those two questions is "positioning," and positioning decides which documents you will need. Nothing on this page is a legal determination; it is a map of what to ask.
Why "under 20 vs 20 mmHg and above" is usually the first question
In the United States, compression products at or above roughly 20 mmHg are generally treated as medical devices, with some types often requiring a premarket submission such as a 510(k); products below that level and positioned for general wellness are often treated differently. The exact boundary, the applicable product code, and whether a submission is required depend on intended use and claims. Because real product lines straddle the line — Aby-Tex's own published sock range includes a 15–20 mmHg zippered style — a single product can sit right on the boundary. The pressure band on a page is a label to verify, not proof of compliance.
The same logic runs outside the U.S.: in the EU, the Medical Device Regulation (MDR) classifies therapeutic compression products under its own scheme (the depth of that analysis is a separate topic).
Graduated vs uniform compression: different claims, different evidence
How the pressure is distributed changes what a claim actually says — graduated compression is highest at the ankle and decreases up the leg, while uniform compression does not make that gradient claim — so the two call for different measurements in the test report; the claim-and-data alignment argument itself is a separate topic, covered elsewhere in this series.
If you are still deciding which manufacturer to use, or how to write the spec that these documents will describe, start with the manufacturer selection guide. This article picks up after the product is defined.
2. What a "usable" test report looks like
"The factory says it has tests" is not a document you can file. A usable report is one you can match to a specific product, for a specific claim, produced by a named lab on a stated date.
The basic elements of a usable report
Product identification: The report must name your product, not a generic category — SKU / model / product name matches your order
Construction and materials: Zippered vs non-zippered, knit structure, fiber content all affect results — Report describes the same build you are buying
Size / size range tested: Pressure and fit depend on size; one size does not cover the range — The tested size matches the sizes you will sell
Test method or standard cited: A number without a method is not a result — A defined method is named, not just "in-house test"
Testing laboratory and location: Who produced the data, and where — A named lab; note whether it is in-house or third-party
Date of test: Recency relative to your production and design — Dated, and still valid for your current construction
Result / measured values: You need the actual data, not a pass/fail word — Measured values or clear pass/fail against a stated limit
Sample identity: Ties the paper to the exact item tested — Sample ID or photo linking report to product
Pressure / gradient measurement and fabric performance are two different reports
Do not use one for the other. A pressure or gradient measurement report supports a compression claim. Fabric performance testing (for example stretch and recovery, dimensional stability, pilling, colorfastness, or composition) supports material and durability claims. Ask, for each document, which claim is this report meant to support? If the supplier cannot answer that, the report was not written for your purpose.
Red flags: reports that will not protect you
Undated, or dated so long ago it no longer reflects your construction.
Covers a different construction, a different yarn, or a size you do not sell.
No laboratory named, or an unnamed "internal lab" with no method.
No test method stated — just a number or a check mark.
A certificate-style page with no underlying test data.
A report that names a competitor's product or a generic category.
3. The document set an importer should be able to file
Think in three layers. Each layer answers a different question, and a document from one layer does not substitute for another.
Product layer — composition, care, origin, label content
Material composition statement (the fiber content as it will appear on the label), care and wash instructions, a country-of-origin statement plus how origin is marked on product and carton, and the full label content — brand, size, fiber, care, origin. Confirm any market-specific labelling requirements for your destination before artwork is finalised.
Performance layer — test reports tied to the claims you will make
Whatever you print or claim needs a report behind it: pressure and gradient measurement for compression claims, fabric performance for material claims. If you position the product for a therapeutic or medical use, additional pathway documents may apply, and those are exactly the items you must confirm against the current rules rather than assume.
Quality and shipment layer — inspection, batch traceability
Pre-shipment inspection reports, in-process quality checks, a batch or lot identification convention, and a packaging check. Aby-Tex's site describes a process that runs from raw-material confirmation through pre-shipment inspection, with optional third-party inspection or testing such as SGS or Intertek. That is a description of a process, not a certification claim — certifications remain something you ask about and verify for any supplier.
Report vs certificate vs declaration: stop treating them as one thing
Test report: Results of defined tests on a specific sample, by a lab, with a method and date — Not a guarantee for other sizes or builds
Certificate: Attests to conformity with a standard or system; scope matters — Not a product test; a management-system certificate is not a product result
Declaration: A statement of conformity by a responsible party — Not test data; it asserts compliance rather than proving it
If you sell on Amazon, some of these documents may be requested when you create or maintain a listing; the execution side of that — identifiers, packaging and replenishment — is handled in launching a private-label compression sock brand on Amazon, not here. And because document expectations shift by market and channel, it is worth checking compression solutions for different markets when you sell into more than one.
4. Questions to verify a factory's compliance claims
Ask for documents, not adjectives
"We have certification," "we are FDA approved," and "our socks are CE" are adjectives, not evidence. Ask for the specific document, the issuer, the date, and the scope it covers. Ask which certificates are already held and which would be obtained through a third party on request — and get the answer in writing. How a supplier responds to that request is itself a signal; for the sampling-to-repeat-order side of supplier trust, see how a knitted support supplier builds buyer confidence.
Check the scope: does it cover your product, size and construction?
A certificate for a different product line, or a report for a different size, does not cover your SKU. Ask the supplier to complete a short cross-reference: for each document, which of your products, sizes and claims does it cover? If a document cannot be tied to your item, it does not belong in your file.
Build an evidence file per SKU, and reuse it
Keep one folder per SKU containing the documents, their dates, and a note of which claim each one supports. On a reorder or a new listing, reuse the file — unless the yarn, construction or factory changes, in which case the evidence needs to be refreshed. This is what makes an audit or a platform request answerable in minutes instead of weeks.
5. mmHg bands: a buyer-reference table (with verification notice)
General industry reference. The bands below are commonly used across the industry to organise pressure ranges; they are general industry education, not legal advice, and every threshold and its compliance meaning must be checked against the current FDA and EU regulations before you rely on them.
Under 20: Often marketed for general wellness, comfort, travel or everyday support — What claim does the packaging make, and which report backs it?
20–30: Frequently the range where products start to be positioned as therapeutic or medical — Which pathway is claimed, and which documents go with it?
30–40: Often associated with therapeutic or medical positioning, sometimes with higher-level documentation — Does a premarket submission apply, and who holds the documents?
Above 40: Higher-pressure products may attract more scrutiny — confirm which pathway applies — What is the full document chain, and are required submissions in place?
The purpose of this table is not to classify your product for you — it is to give you the questions to ask. The bands are an industry-general reference, they do not by themselves fix a regulatory pathway, and their meaning varies — confirm against the current rule.
6. Compliance document request checklist to send your factory
Print this, fill in the buyer-owned fields, and send it with your product positioning. It is the whole article on one page.
Buyer-owned positioning
Intended use and user (therapeutic / medical vs general wellness or comfort)
Target pressure class, stated in mmHg
Target market and sales channel
The exact claims you plan to print on packaging or a listing
Documents to request from the factory
Test reports tied to each claim (pressure / gradient measurement; fabric performance)
Material composition statement
Care and wash instructions
Country-of-origin statement and marking
Label content and packaging artwork proof
Any conformity certificate or declaration for a standard you require — ask explicitly, do not assume it exists
Any declaration or registration document for a medical-device pathway, if it applies
Third-party inspection or test reports, if you commission them
Batch / lot traceability convention
Pre-shipment inspection report and packaging check record
Per-document checks
Names your product, size and construction
Names the laboratory or issuer
States the test method
Carries a date, and is current for your production
Matches the specific claim it is meant to support
If the product itself needs to change beyond a catalog item before these documents can exist, that capability is worth checking early — Aby-Tex describes flexible OEM capabilities, and compliance documents have to be written against the final construction.
7. Quick answers (FAQ)
Do compression socks need FDA approval?
In the U.S., compression products at or above roughly 20 mmHg are often treated as medical devices, and some may require a premarket submission such as a 510(k), while lower-pressure products positioned for general wellness are often treated differently. "Approval" is not the right frame for most of this category — many devices are cleared or registered rather than "approved," and what applies depends on classification and intended use. Confirm the current FDA position for your exact product before printing anything like "FDA approved."
What is a compression sock test report?
A document from a testing laboratory recording the result of a defined test, with a stated method, on a specific sample. For compression socks the relevant reports usually fall into two families: pressure / gradient measurement, which supports compression claims, and fabric performance, which supports material and durability claims. A report is only useful if it identifies your product, size and construction. Check the scope and method before you rely on it.
How many mmHg makes a compression sock a medical device?
There is a commonly cited industry framing that products at or above roughly 20 mmHg are generally treated as medical devices, but this is a generalisation rather than a fixed rule — classification depends on intended use, claims and the current regulation. Confirm the current threshold and classification against the FDA and EU rules before you label or list on that basis.
Can a factory's certificate replace a test report?
No. A certificate (for example a management-system or conformity certificate) attests to something different from a product test report, and a declaration is a party's statement rather than test data. Ask for the specific document that answers your specific question, and check that it names your product, size and construction.
8. Next step
Take the request checklist above, fill in your positioning (intended use, mmHg band, target market), and send it to a manufacturer to ask for verifiable test reports and documents, plus a quote. Use the contact page (/contact-us) or email sales@aby-tex.com; Aby-Tex states a target of a reply within 24 business hours. For reference, Aby-Tex states a 7-day target for custom sampling on its site, with production lead time quoted separately.
