How to Specify Grounding Sheet Sizes for Different Markets
Specify grounding sheet sizes from the intended mattress dimensions and the finished sheet’s measured fit, then attach the local retail size name. “King” or “Queen” alone is not a production specification. Buyers should identify the mattress footprint and depth, the sheet’s intended coverage, dimensional tolerances, measurement state and supported care conditions before approving regional packaging.
This guide is for importers and private-label bedding buyers adapting a grounding sheet range for different markets. It focuses on translating local size names into physical requirements and customer-facing information. It is not a universal mattress-size chart or a list of ECOBRIDGE stock dimensions. Dimensions, conductive construction, accessories and care performance must be confirmed for the actual order.
The commercial problem often appears late: the sample matches the factory’s drawing, the packaging carries a familiar size name, yet the customer’s mattress does not fit the promise. Preventing that mismatch requires three connected descriptions of the product: the mattress it serves, the article the factory measures, and the coverage the shopper expects.
The same size name can point to a different mattress
A market name helps customers shop within a local range. It should not be used as a shortcut for transferring dimensions between countries, brands or models. Even a useful national size guide is a starting reference rather than a substitute for the mattress range a retailer actually serves.
Consider these two first-party listings, checked on 23 October 2026. Both use “King,” but their published footprints differ substantially.
| Published example | Size name | Listed width × length | Meaning for sheet development |
|---|---|---|---|
| Sealy UK, Blake Medium | King | 150 × 200 cm, equivalent to 1,500 × 2,000 mm | A reference for that listed mattress model; confirm the intended depth and actual fit sample separately. |
| Sealy Australia, published Posturepedic size selector | King | 1,835 × 2,030 mm | The same retail name does not describe the same footprint as the UK example. |
These are mattress examples from named sources, not universal country specifications or grounding-sheet compatibility claims. The width difference between these two examples is 335 mm. A label translation cannot remove that physical difference.
For a new market, ask the retail or distribution team which mattress models and size ranges drive the intended demand. Record the source and review date for each reference. If a generic guide and a particular model page disagree, resolve the target with the buyer instead of silently choosing the more convenient number.
Keep the format decision separate from this work. Our flat-versus-fitted grounding sheet guide addresses which format belongs in a range. Once that choice is made, the next task is to define the actual fit and coverage for each destination.
Build a crosswalk between names, mattresses and finished articles
A useful size crosswalk is a translation record, not just a list of size-name equivalents. For each market-facing version, connect the local name to an identified mattress target and an approved finished-article drawing. This avoids treating a translated word as proof that two products are interchangeable.
| Description | What the buyer should define | A common misunderstanding |
|---|---|---|
| Local retail name | Market, sales channel and exact wording used in that range | A familiar name automatically carries the same dimensions everywhere. |
| Target mattress | Width, length, depth or depth range, corner profile and any topper included in the promise | Mattress footprint alone determines fitted-sheet compatibility. |
| Finished sheet | Measurement points, dimensions, tolerances, construction and measurement state | Cut-fabric dimensions are the same as finished dimensions after sewing. |
| Usable coverage | The intended contact zone and placement on the bed, distinguished from the overall fabric footprint | Every part of an oversized sheet necessarily provides the intended conductive contact area. |
| Customer information | Which measurements describe the mattress, which describe the product, and how placement is illustrated | A dimension printed beside a bed image has an obvious meaning to every shopper. |
Give width and length an explicit order on the drawing. Include an orientation mark and connector location measured from identified edges. If two teams rotate the same rectangle in their documents, apparently correct numbers can still produce an incorrect connector position or misleading product image.
Use one controlling unit system for the approved specification, with reviewed conversions for retail communication. One inch is exactly 25.4 mm. For example, converting 80 inches gives 2,032 mm; choosing to describe a target as 2,030 mm is a nominal-size decision, not an exact conversion. Document which value controls and how display rounding is handled. Do not let a rounded package number quietly replace the approved production dimension.
Define how the sample is measured before debating tolerance
A tolerance only helps when both parties measure the same feature in the same state. “Within tolerance” is not meaningful if the factory measures a stretched fitted sheet while the buyer measures it relaxed, or if one record describes unfinished fabric and another describes the sewn article.
Agree the preparation, support surface, orientation and measurement points. State whether measurements are taken relaxed or under a defined, repeatable condition, how wrinkles are handled, and which construction features are included. Keep photographs or a simple annotated drawing with the measurement record.
ISO 3759:2011 addresses preparation, marking and measuring textile specimens and articles for dimensional-change testing. It is relevant to discussing a reproducible measurement basis. Its scope does not supply a universal grounding-sheet tolerance, a mattress-fit allowance or an electrical acceptance criterion. The applicable procedure and product requirements still need technical agreement.
For a fitted article, record the relevant panel, seam and pocket measurements, but also approve installed fit on the reference mattress. A nominal pocket-depth value alone does not show how the corners hold, whether the lower edge remains engaged, or whether the top surface is pulled excessively. Establish the fit assessment for the promised mattress-depth range.
For a flat article, distinguish overall finished size from the dimensions of any designated conductive or contact zone. If the commercial concept is a band across the bed, the listing should show that placement. If the promise is broader coverage, identify the required overhang or tuck and the orientation used to achieve it.
Check the small end of the size range after the intended care
A nominal dimension can appear adequate while the permitted lower limit leaves too little coverage. Dimensional change during the supported care process can reduce that margin further. Evaluate the combination the customer may receive, rather than approving only a generous sample close to the top of the tolerance band.
Hypothetical planning example: a buyer wants a flat sheet to span a mattress 1,800 mm wide, with at least 375 mm of fabric extending past each side in the agreed placement. The required width in that scenario is 1,800 + 375 + 375 = 2,550 mm. These figures illustrate a purchasing calculation; they are not ECOBRIDGE specifications or recommended allowances.
Suppose the proposed finished width is 2,600 mm with a ±20 mm tolerance. Its lower limit is 2,580 mm. If the planning exercise assumes a further 2% reduction in width after the selected care sequence, that lower-limit article becomes 2,580 × 0.98 = 2,528.4 mm. It falls below the buyer’s hypothetical 2,550 mm requirement even though a new nominal sample appears wide enough.
The 2% figure is an assumption for this example, not test data or a claim about conductive textiles. Actual development needs identified before-and-after results. The calculation also does not account for every installed-fit effect, measurement uncertainty or distortion. It flags a question to resolve with samples; it does not replace the fit trial.
The purchasing options are to revise the finished specification, revise the supported coverage promise, or develop a construction whose evidence supports the intended result. Increasing a dimension on paper is not sufficient if the revised article has not been evaluated. Review the width and length directions separately rather than assuming identical change in both.
Use the care procedure that the customer will be instructed to follow, with a defined measurement state afterward. The conductive textile care-instruction guide explains why complete wash-and-dry records and finished-article evidence belong together. This size review asks a narrower question: does the supported care history still leave the promised fit or coverage?
Fit approval must include the contact area and connection position
A sheet can cover the bed neatly while placing its intended contact area or connector in an inconvenient position. Conversely, a conductive-path check on an uninstalled sample cannot establish that the installed article fits the target mattress.
On the reference setup, inspect where the intended contact zone lies, whether seams or borders change that placement, and whether ordinary fitting pulls the connector area. Confirm the cord can be attached in the intended arrangement without relying on sheet stretching to reach the connection. Record relevant bed-frame and mattress-position constraints when they affect the approved layout.
Keep the dimensional and electrical decisions distinct in the record. A fit assessment supports the stated physical compatibility. The specified electrical method addresses the measured conductive route under its stated conditions. Neither finding establishes a health outcome, and neither automatically covers a larger or differently constructed version.
Photograph the approved placement from a clear orientation. The same image or a faithful diagram can inform the customer-facing size illustration, provided the actual article and covered configuration remain identifiable. A generic bed photograph without dimensions is weak evidence of either coverage or compatibility.
Make the package say what the numbers describe
For a fitted sheet, distinguish a statement such as “fits the approved mattress range” from the finished dimensions measured on the textile. For a flat sheet, state the finished length and width and show whether the article is intended to cover the whole bed or a defined portion. Review the exact wording with the local sales and artwork teams before print.
A bed outline with labeled measurement arrows is often clearer than a large “King” badge. The diagram should identify width, length and the relevant depth or placement information, with units visible. Where metric and imperial displays appear together, check that the rounding is consistent with the approved specification and does not imply a tighter promise.
Localizing packaging is also more than changing the name on the front panel. Check the size selector on the product page, variant image, sewn label where applicable, insert and outer carton against the same approved crosswalk. Keep exact regional item identities in the ordering record; our color-and-size variant control guide covers that inventory and product-data work in more detail.
If one physical article is proposed for several markets, approve each intended description and supported mattress application. Shared fabric dimensions do not by themselves establish a shared retail fit promise. The buyer may need different descriptions or a narrower compatibility statement even when the factory drawing is common.
Use returns to find the missing measurement
A return marked “wrong size” is only the beginning of an investigation. Ask which market version was supplied, what the customer expected, the mattress’s actual dimensions and depth, whether a topper was present, and whether the complaint arose before or after care. Compare that information with the retained article and the published size description.
A cluster of deep-mattress complaints may point to an unsupported depth range. Flat-sheet complaints may reflect coverage expectations rather than a manufacturing error. Post-care complaints may require comparison with the approved care record and dimensional limits. Keep these causes separate before changing the factory specification.
When a revision is justified, update the drawing, approval sample and market crosswalk together, then reconcile the package and listing. Check how remaining stock will be identified. Quietly widening a size promise online while older packaging remains in circulation creates a new mismatch instead of resolving the old one.
Frequently asked questions
Is a King grounding sheet the same size in every market?
No. The named first-party examples above use the same mattress size name for different footprints. Confirm the target mattress dimensions and intended sheet application for the actual sales channel before assigning the retail name.
Should the purchase order state mattress size or finished sheet size?
It should distinguish both where relevant. The mattress target defines the application; the finished-article drawing defines what is measured in production. Add the fit or coverage criteria that connect them, including depth for fitted applications.
Can I convert an inch size to centimeters and use the rounded result?
Use a reviewed conversion, identify the controlling production unit and document display rounding. A convenient nominal metric description may differ from an exact conversion. Do not let retail rounding change the accepted manufacturing dimension without approval.
Does deeper pocket wording guarantee a fitted sheet will fit?
Not by itself. Evaluate the complete article on the intended mattress-depth range, including corners, elastic engagement, top-surface tension and connector position. The approved fit method must define what acceptable fit means for that construction.
Should size be checked before or after washing?
Record the as-received dimensions and the relevant measurements after the supported care sequence, using comparable preparation and measurement methods. Agree which criteria apply at each stage. A new sample’s dimensions do not establish post-care fit.
Can one flat grounding sheet be sold under several local size names?
Possibly, if its approved coverage genuinely supports each description. Use an explicit market crosswalk, dimensions and placement diagram. Shared physical dimensions alone do not justify every local compatibility claim.
What should be reviewed when adding a larger size?
Review the finished measurements and limits, contact-area layout, seams, connector location, installed fit, relevant care evidence and the product’s specified electrical checks. Then align the local listing and packaging with the approved version.
For an international grounding-sheet project, approve the chain from local name to mattress target, finished article and customer explanation. That gives purchasing, production and the retail team the same physical promise to work from.