A fitted sheet that is bunched up in the middle of the bed in the morning almost always has the same cause: It doesn't fit the mattress. It's not just length and width that determine whether the sheet stays in place, but above all the pocket depth. In short: The pocket must be at least as high as your mattress including topper and mattress protector – for a 20 cm setup, a standard pocket is sufficient, from 30 cm you need an Elastic variant. What quality is right, however, depends on how high your bed is built, how stretchy the material is, and in which season you use it. Once you have correctly determined the fitted sheet pocket depth, you will reliably buy the right fit afterwards – regardless of whether a flat cold foam mattress or a high box spring setup is on the bed.
What the pocket depth exactly describes
The pocket depth is the height of the fabric strip on the side that runs down from the sleeping surface around the mattress edge until the built-in elastic catches. It determines how much of the mattress height the sheet can enclose. If the pocket is too low, the elastic sits just under the edge and slips off with every movement. If it is significantly too high, excess fabric remains under the mattress – this is less of a problem, but can cause wrinkles at the corners.
Therefore, do not measure the bed frame, but the mattress itself: length, width, and height at the side edge, measured in an unladen state. Add a few centimeters to the mattress height if you also use a topper or a mattress protector – both increase the setup noticeably.
The right pocket depth for your mattress
As a guide, three areas have proven themselves:
-
Up to approx. 20 cm mattress height: classic fitted sheets with a standard pocket. Typical for older spring core and slim cold foam mattresses.
-
Approx. 20–30 cm: the most common case today. Modern mattresses are usually in this range, often supplemented by a topper.
-
Over 30 cm: high setups and box spring beds. Here you expressly need a fitted sheet with an increased pocket, otherwise the corners will reliably pop off.
The good news: Stretchy qualities forgive a lot. A jersey or fine jersey sheet adapts to a wide range of heights because the knitted fabric gives in both directions. Woven sheets – such as those made of flannel or percale – on the other hand, hardly stretch and must be closer to the actual dimensions. How the constructions differ, you can read in the comparison Jersey, Fine Jersey and Elastic.
Which quality fits which setup?
The following overview shows which construction is made for which bed setup. The decisive factor is always the size and pocket depth specification on the respective product page – the prices are manufacturer direct prices, and we always deliver free of charge within Germany, without a minimum order value.
The complete sizes and colors can be found in the collections Jersey Fitted Sheets, Flannel Fitted Sheets and Terry Fitted Sheets.
Special case Box spring bed
With the box spring bed, the box, mattress, and topper add up to a total height that quickly reaches 35 to 45 cm. The decisive factor is which level you want to cover: Usually, a sheet for the topper alone is sufficient – that is significantly easier to change than one over the entire setup. We have summarized the details about this in our guide Fitted Sheet for Box Spring Beds.
Length and width: Tolerance is desired
Unlike with the bed cover, a certain undersize is intentional with the fitted sheet. Elastic sheets are deliberately cut slightly tighter so that the tension is created, which ensures the smooth sleeping surface. So do not buy "one size larger" because the sheet seems tight at first – that is exactly how it is supposed to be.
For double beds with two separate mattresses, you need two single sheets in the respective single width, not one continuous one. And for oversized beds, it is worth looking at the actual centimeter specifications instead of designations like "King Size", which are defined differently depending on the country. The common size ranges are 90x190–100x200 cm for single beds, 140x200–160x200 cm and 180x200–200x200 cm for double and box spring beds; for children's beds, there are separate sizes from 60x120 cm. An overview of the common dimensions is given in our post Bedding Sizes Explained.
Material and workmanship determine durability
A fitted sheet is stressed more than any other part in the bed: It is stretched, rubbed, and washed frequently. That is why the substance counts here. Look for an all-around built-in elastic instead of just a corner elastic, clean edge processing, and a material that retains its resilience after washing.
In our assortment you will find fitted sheets in various qualities – from elastic Jersey for year-round use to the cozy Flannel Fitted Sheet for cold nights. We manufacture our flannel and molton sheets fully in-house in Hamminkeln – Made in Germany, from the weaving mill to the garment factory. Behind all qualities is a family business that has been collecting experience with bedding since 1932. That is the reason why our sheets remain true to size – pre-shrunk goods do not suddenly shrink by two sizes in the first wash. Correspondingly, you can find the matching covers in the same quality in the Bedding area.
Frequently Asked Questions
How do I measure the pocket depth correctly?
Measure the height of the mattress side from the sleeping surface to the lower edge, in an unladen state. If you use a topper or mattress protector, add its height to it. The result is the minimum pocket depth that your fitted sheet must cover.
What happens if the pocket depth is too small?
The elastic then sits too high on the mattress edge and has too little grip. The sheet pops off at the corners at night and creates wrinkles. With highly stretchable jersey qualities, a small deviation can be compensated, with woven sheets made of flannel or percale, it cannot.
Can the pocket depth also be too large?
Functionally, this is not critical – the excess fabric disappears under the mattress. However, with a very large difference, there can be wrinkling at the corners. In case of doubt, choose slightly more pocket depth than too little.
Do I need a separate sheet for the topper?
Not necessarily, but it is the more convenient solution. A sheet like the biberna Jersey-Elastic-Topper Fitted Sheet (0077641) only covers the top layer and can be pulled off in seconds for changing – instead of having to lift the entire box spring setup.
Which fitted sheet is warm in winter?
Brushed or densely woven qualities: Flannel Fitted Sheet, the Terry-Stretch Fitted Sheet or the Molton Fitted Sheet, which also serves as a mattress protector.
Which fitted sheet is good for summer?
Jersey and fine jersey are elastic, breathable, and popular year-round, but especially pleasantly cool on the skin in summer.
What is a fitted sheet for waterbeds?
Waterbeds need particularly elastic sheets that follow the movement of the water mattress – for example the biberna Jersey-Elastic Fitted Sheet. More about this in the post Fitted Sheet for Waterbeds.
