For a deep mattress or a bed with a topper, choose a silk fitted sheet using three measurements: width, length and the full height of the bedding stack. A pocket described as deep is only useful if its stated dimensions suit your actual bed. A Queen or King label does not tell you the pocket depth.
This guide focuses on height and corner fit. For the standard width and length of Australian beds, use our silk sheet size guide. Then compare silk fitted sheets using the exact numbers rather than the bed name alone.
Measure with the Bed Set Up for Sleep
Leave your usual topper and mattress protector in place. Measure vertically from the bottom of the mattress to the top of the sleeping surface without pressing the topper down. A straight edge across the top can help you read the height accurately with a tape measure.
Measure width and length separately. If the topper overhangs or is smaller than the mattress, correct its position and make sure it is the right size before choosing the sheet. A fitted sheet should not be expected to hold an incorrectly sized topper in place.
Pocket Depth and Mattress Height Are Related, Not Identical
Pocket depth describes the sheet's shaped side, but brands do not always explain maximum mattress fit in the same way. Look for a stated compatible mattress height as well as the pocket measurement. The elastic needs to settle securely around the mattress rather than sit stretched at the very edge.
Do not add a universal allowance and assume every sheet will fit. Construction and elastic placement differ. Use the dimensions and fit guidance for the specific product, and choose a clearly suitable option for a tall stack.
Worked Examples
| Mattress setup | Total height | What the measurement tells you |
|---|---|---|
| 24 cm mattress + 4 cm topper | 28 cm | Compare the sheet’s stated fit and room for its elastic; 30 cm is not an automatic guarantee. |
| 28 cm mattress + 5 cm topper | 33 cm | A listed 30 cm pocket is shallower than the stack. |
| 35 cm mattress, no topper | 35 cm | Choose a product whose specified mattress fit covers that height. |
| 25 cm mattress + 8 cm topper | 33 cm | Treat it as a 33 cm stack, not a 25 cm mattress. |
How This Applies to SB52
SB52's 23 momme mulberry silk fitted sheet lists a 30 cm pocket. That is useful concrete information when comparing your bed, but it should not be described as suitable for every deep mattress. A 33 cm or 35 cm stack needs a different confirmed fit.
The product also has a pillowcase-only option. Select a sheet size to compare a fitted sheet, and read the selected variant dimensions. If no available option fits your measured bed, choose a different product with the appropriate specification rather than stretching silk over an unsuitable mattress.
Avoid Two Common Sizing Shortcuts
First, do not move from Queen to King purely to gain depth. The larger footprint can bunch across the bed while the corner shape remains wrong. Second, do not compress a topper to make the measurement smaller. It will expand again in use and pull against the sheet.
For adjustable beds, follow the bed manufacturer's bedding guidance and check that the sheet stays comfortable through normal positions. For split beds, measure each mattress separately; one large fitted sheet may prevent the halves moving as intended.
Choose the Rest of the Bedding Separately
A silk flat sheet needs enough width and length for drape and tuck, but it does not fix the fit of a fitted sheet underneath. A duvet cover is sized to the duvet, not mattress depth. If buying a silk bedding set, check each included component rather than assuming one size label covers them all.
Once the fitted sheet is right, make the bed gently and check whether the corner elastic remains below the mattress during use. If it lifts, our slipping-sheet checklist helps identify the cause. Choose your silk fitted sheet with the full measurements in front of you.
Frequently Asked Questions
Does deep pocket always mean 40 cm or more?
No. The term is not a substitute for a numerical specification. Compare the listed depth and stated mattress fit.
Should I include a mattress topper?
Yes. Include every layer that remains beneath the fitted sheet when you sleep.
Can a flat sheet be an alternative?
A generously sized flat sheet can be tucked around a bed, but it has no fitted elastic and behaves differently. Choose it for that format, not as an identical replacement.
Will silk stretch to fit a deeper mattress?
Do not rely on stretching delicate silk to make up a size mismatch. Choose a compatible fitted-sheet specification.