Collection: Extra Deep Fitted Sheets – 40cm Deep Bed Sheets

40cm Extra Deep Fitted Sheets for Deeper Mattresses

If a standard fitted sheet feels too tight or repeatedly slips away from the corners, the mattress may simply need a deeper pocket.

Our extra deep fitted sheets are designed with a generous 40cm depth, giving deeper mattresses more room while helping the sheet sit smoothly around the sides of the bed.

The Stoftly range includes soft microfibre options in plain and satin-stripe finishes, with Double, King and Super King sizes available across the collection and selected designs also offered in Single.

What Is a 40cm Deep Fitted Sheet?

A 40cm fitted sheet has a deeper side section designed to accommodate mattresses with greater depth than those suited to conventional or 30cm sheets.

The elasticated edges fit around the mattress and tuck underneath it, helping keep the sheet in position throughout everyday use.

Mattress depth can vary considerably, especially when toppers or particularly thick mattress constructions are involved. Measuring your bed before ordering is therefore more reliable than choosing a fitted sheet based only on the mattress width and length.

When Should You Choose an Extra Deep Fitted Sheet?

A 40cm extra deep fitted sheet may be worth considering when your mattress is particularly deep or when your current sheet does not comfortably reach underneath it.

It can also be useful where a mattress topper adds noticeable height to the sleeping surface.

Signs that you may need a deeper sheet include corners repeatedly pulling free, excessively stretched fabric or a fitted sheet that only just reaches the bottom edge of the mattress.

Measure first, as using a much deeper sheet than you actually need can also leave unnecessary loose fabric.

Extra Deep Fitted Sheets for UK Bed Sizes

Our 40cm fitted-sheet range covers the most common larger UK mattress sizes, with selected Single options depending on the design.

Double Extra Deep Fitted Sheets

Our Double options measure approximately 137 x 193cm with a 40cm depth across the relevant products.

A 40cm deep Double fitted sheet provides additional side coverage for thicker Double mattresses while keeping the familiar width and length of the bed size.

King Extra Deep Fitted Sheets

King options measure approximately 152 x 203cm with a 40cm depth.

They are designed for UK King mattresses that require a more generous pocket than a shallower fitted sheet can provide.

Super King Extra Deep Fitted Sheets

Our Super King options measure approximately 183 x 203cm with a 40cm depth across the relevant designs.

The greater mattress width makes choosing the correct dimensions especially important, so check the individual product measurements before purchasing.

Single Extra Deep Fitted Sheets

Selected designs are also available for Single mattresses, measuring approximately 91 x 193cm with a 40cm depth.

Availability varies between products, so always check the size selector on the individual product page.

Plain and Striped 40cm Fitted Sheets

The collection includes different finishes to suit the look of your bedroom.

Plain fitted sheets offer a simple, versatile base that works easily with patterned or neutral duvet covers.

For a more decorative finish, our satin-stripe extra deep fitted sheet features subtle woven-style stripes that introduce texture without making the bedding look overly busy.

Available colours include White, Grey and Silver Grey across selected designs.

400 and 600 Thread Count Options

Our extra-deep range includes products described in 400 thread count and 600 thread count specifications, alongside our striped 600 thread count design.

All of the products in this collection use soft microfibre.

Thread count can be one factor when comparing sheets, but it should not be the only one. Mattress depth, fabric, finish, dimensions and colour are equally important when choosing the right fitted sheet for your bed.

30cm or 40cm Fitted Sheet – Which Should You Choose?

The best choice depends on the actual depth of your mattress.

Our 30cm deep fitted sheets provide a generous pocket for many mattresses, while the 40cm range gives you additional depth for particularly thick mattresses or mattress-and-topper combinations.

Measure vertically from the top of your mattress to its bottom edge.

If a topper always stays on the bed beneath your fitted sheet, include the topper when taking the measurement.

Then compare your measurement with the pocket depth stated on the individual product page.

How to Measure Your Mattress for an Extra Deep Sheet

Start by confirming the mattress width and length so you know whether you need Single, Double, King or Super King.

Next, measure from the top sleeping surface down to the bottom edge of the mattress.

For beds with a mattress topper, measure the combined height if the sheet is intended to cover both.

Checking these measurements before ordering can help prevent a sheet being either too tight or unnecessarily loose.

Extra Deep Sheets for a Neat, Comfortable Bed

A correctly sized fitted sheet should sit comfortably around the mattress without excessive stretching at the corners.

Our 40cm range gives you extra depth while retaining a simple design that is easy to coordinate with the rest of your bedding.

Choose between plain and striped finishes, then select the size and colour suited to your mattress and bedroom.

For a wider choice of depths and styles, browse our complete fitted sheets collection.