Flat Sheet vs Fitted Sheet (2025)

Updated: December 20, 2024

If you’ve ever purchased or received a sheet set, you’ve likely encountered both flat and fitted bed sheets.

• A flat sheet is a rectangular piece of fabric that typically lies between the sleeper and their comforter or duvet, adding an extra layer of protection and comfort.
• A fitted sheet, on the other hand, is designed with elasticized edges to fit snugly over the mattress and provide a secure sleeping surface.

While some people use both types of sheets for added comfort and protection, others prefer to use only one or the other. In this article, we’ll further detail the differences between fitted vs flat sheets, how to care for each one, and common sheet materials.

 

What is a flat sheet?

A flat sheet (also called a top sheet) is just what it sounds like—a large, flat piece of fabric that often comes as part of a sheet set. Typically placed between the sleeper and the main blanket or duvet, a flat sheet serves as a barrier to keep the duvet clean and add a touch of extra comfort.

Flat sheets are usually larger than the mattress itself, even when ordered in the same size. This added length and width allows the sheet to drape over the sides of the mattress, making it easy to tuck in for a neater appearance. This design also accommodates taller mattresses or those with toppers, ensuring full coverage.

While some sleepers love the extra layer and versatility a flat sheet provides, it’s not for everyone. You may prefer to sleep only with a fitted sheet, paired with a comforter or duvet. However, there can be benefits to using a flat sheet.

 

 

Benefits of flat sheets

It’s not necessary to sleep with a flat sheet, but it can make a few aspects of caring for your sleep setup a little easier. Plus, flat sheets are simple to care for and they fold up easily.

• You won’t have to launder your duvet cover or comforter as often. Washing your sheets is a lot easier than cleaning your duvet, duvet cover, or comforter. Using a flat sheet means you’ll only need to launder your sheets every week (which is much easier to handle) instead of struggling to put on your duvet cover every weekend.
• It helps you stay at an ideal temperature. Using both a flat and fitted sheet made from materials with specific properties, like cooling or heat-retaining fabrics, helps maximize their benefits. Warm sleepers can enjoy better temperature control with a cooling flat sheet, such as cotton or bamboo. Cool sleepers can stay warmer by using flannel or other heat-retaining materials as a flat sheet.
• It makes your sleep environment more comfortable. If you’ve ever slept in a hotel, you may have noticed there’s almost always both a flat and a fitted sheet. Creating this personalized sleep experience can make your bed feel more comfortable, which will in turn helps you fall asleep more quickly and stay asleep longer.

 

What is a fitted sheet?

A fitted sheet is the part of a sheet set designed to cover and protect your mattress. With elasticized corners—and sometimes elastic along the sides—it wraps securely around the mattress, creating a smooth and comfortable sleeping surface that stays in place through the night.

Fitted sheets can look unusual when not on a mattress due to their elastic edges, which create a 3D shape that folds into itself and rounds at the corners. This unique shape can make folding and storing them a bit tricky.

Although fitted sheets can be a hassle to fold and store, using a fitted sheet is essential for mattress protection and overall sleep hygiene.

If you don’t have a fitted sheet, you can always use an extra flat sheet in its place and simply tuck the edges under your mattress. Either way, we recommend always sleeping on bedding instead of directly on your mattress.

 

 

Benefits of fitted sheets

• It helps keep your mattress and sleep environment clean. In the same way a flat sheet protects your duvet from dirt and oil buildup, a fitted sheet protects your mattress and helps it last longer. Although some mattresses have removable and machine-washable top covers, not all do, and using a fitted sheet is an extra layer of protection. It’s also less of a hassle to launder than a cover. You should wash your sheets weekly to remove allergens and dust.
• It’s one of the easiest pieces of bedding to care for. You may have a machine-washable cover, as well as a mattress protector, but both of these items require more effort to wash. Washing a fitted sheet is as simple as throwing it in the washer and dryer.
• It creates an even sleeping surface. Sleeping on a fitted sheet will be significantly more comfortable than trying to rest on a mattress protector, or directly on the surface of your mattress. It fits your mattress nicely, and smooths out any mattress surface, including tufted or buttoned mattress covers. Fostering a comfortable sleep environment will help you get more restful sleep.

6 differences between flat and fitted sheets

We’ve established that flat and fitted sheets are both important in their own ways. But what makes them different from one another?

 

Use

Flat sheets are typically placed over the sleeper, between them and their comforter or duvet. If needed, a flat sheet can double as a fitted sheet by tucking its edges under the mattress, though this is not ideal. However, using a fitted sheet as a flat sheet isn’t practical due to its elastic edges.

 

Shape

Flat and fitted sheets are easy to distinguish by their shape. A flat sheet is a simple rectangular piece with straight, clean edges. In contrast, a fitted sheet appears rounded when laid flat due to its elasticized corners, which make it fold inward. Fitted sheets are also defined by their “pocket depth,” allowing them to fit mattresses of varying heights securely.

 

Materials

Both flat and fitted sheets are often sold together in matching sets for convenience, providing a coordinated look and consistent material benefits. However, some companies sell them separately, giving you the flexibility to mix and match materials. This allows for a customized sleep experience; for instance, you might prefer a soft bamboo fitted sheet for its silky feel and a breathable cotton or linen flat sheet for added temperature regulation.

 

Care

If you buy your flat and fitted sheets as part of a set, they can usually be washed and dried the same way. Most bedding can be safely laundered in a washing machine and dried on a low setting to prevent shrinkage. However, it’s important to follow the specific care instructions provided by the manufacturer, as different types of bedding material may require different washing and drying techniques.

 

Folding

Folding a flat sheet is simple due to its straight edges, allowing it to be folded neatly into halves, thirds, or quarters as needed. Fitted sheets, however, present more of a challenge because of their elastic corners. While it may seem tricky, following a step-by-step guide can make folding a fitted sheet easier, helping you keep your bedding organized and neatly stored.

READ MORE: Two easy ways to fold a fitted sheet

 

Flat and fitted sheet dimensions

You might wonder why flat and fitted sheets have different dimensions. Fitted sheets need elasticized edges and extra depth to wrap around the mattress securely, which can make them appear smaller when folded. To ensure a proper fit, your fitted sheet should match your mattress size, as shown in the dimension table below.

Flat sheets, on the other hand, will lay perfectly flat when on the ground. When placed on your mattress or a raised surface, the sheet is meant to drape over the edges. This adds to your mattress’s tidy appearance, makes it possible for you to tuck the edges of your top sheet under your mattress for a snug fit, and gives you extra room to move around under your sheet while you sleep.

Because of this, your flat sheet’s dimensions will be quite a bit larger than those of your mattress and fitted sheet.

 

*Note: Fitted sheets also have a height measurement, which will vary depending on the sheet. You should always be sure to check the height/depth of your fitted sheet to ensure it will fit your mattress properly.

 

Frequently Asked Questions

Which is better, a fitted sheet vs a flat sheet?

Both fitted and flat sheets have their uses and advantages. A flat sheet is more versatile, as it can be used as a top sheet or even in place of a fitted sheet if needed. While using a flat sheet is optional and depends on personal preference, we recommend always having a sheet between you and your mattress for comfort and hygiene. A fitted sheet makes this process the easiest.

 

Do you need both a flat sheet and a fitted sheet?

No, you don’t need to use both a flat and fitted sheet. If you choose just one, a fitted sheet is best for protecting your mattress and providing a comfortable surface. However, adding a flat sheet can have benefits, like protecting your duvet, improving sleep hygiene, and making laundry easier.

 

Can I use a flat sheet as a fitted sheet?

Yes, you can use a flat sheet as a fitted sheet in a pinch. It may take a little more effort to get it to stay snug on your mattress, but it’s a good alternative if a fitted sheet isn’t available. To do this, lay the flat sheet centered on the mattress, tuck in the head and foot, and use military-style corner folds to secure the sheet.

 

How do you put a flat sheet on a bed?

Place your flat sheet over the fitted sheet, with the top edge aligned at the head of the bed and the sides hanging evenly. Tuck the bottom edge under the mattress and fold the bottom corners using military-style folds. Tuck in the sides, leaving the top untucked so you can fold it over your duvet or comforter if desired.

 

Are you supposed to sleep under the flat sheet?

Yes, most people sleep under the flat sheet for an extra layer of comfort and to keep their duvet clean. However, if you don’t like using a flat sheet, it’s not necessary. You can also use a flat sheet as a substitute for a fitted sheet if needed.

 

Why do my fitted sheets keep slipping off the bed?

Your fitted sheets could be slipping off your bed for a number of reasons:

• Wrong size: If it’s too small or the pockets aren’t deep enough, it won’t stay on. If it’s too large, it may shift and slip off.
• Improper tucking: Not fully tucking the sheet under the mattress can cause it to come loose.
• Mattress pad issues: If your mattress protector or topper isn’t aligned correctly, it can cause the sheet to slip.
• Worn-out elastic: Over time, the elastic may lose its stretch from repeated laundering, especially at high temperatures.
• Restless sleeping: Tossing and turning can pull the sheet loose. Using sheet clips can help keep it secure.

 

What is a deep pocket fitted sheet?

A deep-pocket fitted sheet is made to fit thicker mattresses, typically over 15 inches tall. The deeper pockets ensure that the sheet covers the mattress completely and stays in place. Knowing your mattress height can help you choose the right sheet size.

 

How do you wash flat and fitted sheets?

Most flat and fitted sheets can be machine-washed and dried on low heat to prevent shrinkage. Always check the manufacturer’s care instructions, as different bedding materials can require different care.

READ MORE: How often should you wash your sheets?

 

How do you fold a fitted sheet?

Follow the below steps for an easy method to fold your fitted sheet nicely:

• Turn your sheet inside out, lay it down, and place your hands in one top and one bottom corner pocket.
• Touch the corners together, and flip one corner over the other.
• Find the two new corners you’ve created, put one hand inside each one, and repeat the above step.
• Lay your sheet down, and the sheet’s elastic should form a “J” shape. Fold to your desired size.

Looking for more detailed instructions? Watch our videos on how to fold a fitted sheet.

 

What should you consider when buying bed sheets?

When shopping for new bed sheets, there are multiple factors you should consider. Here are some of the top considerations we think you should take into account:

• Thread Count: While thread count isn’t the only indicator of a quality sheet, there’s often a threshold you should consider. A good thread count for sheets will depend on the type of material you choose.
• Fibre Content: When you want the best material for bed sheets, you should look for high-quality materials like 100% Egyptian cotton, European flax, or bamboo for softness and durability.
• Weave Type: If you want a cool, breathable feel, think about getting percale–weave sheets. If you want a smooth and silky texture instead, consider choosing sateen sheets.
• Breathability: Make sure the fabric allows for good airflow to prevent overheating. Natural materials, like cotton and linen, are considered much more breathable than synthetic materials like polyester or microfiber.
• Mattress size: If you have a relatively big bed, that means having to wash bigger sheets. If you’re thinking of buying a new mattress, finding the right mattress size can save you time and effort when laundry day comes.
• Care instructions: Consider how easy the sheets are to maintain and whether they fit your lifestyle. Always read the instructions on the laundry tag to ensure you wash your sheets properly, and remember to do it regularly.
• Brand Reputation: Purchase from reputable brands known for quality and transparency. Read customer feedback on independent review sites like the Better Business Bureau and Trustpilot to get an idea of what a company is like before buying from them.

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Although it can seem like a fairly simple topic, there are many considerations that factor into using flat sheets vs fitted sheets. Some sleepers prefer to use both a flat and fitted sheet, while others prefer the fitted sheet on its own.

When it comes to creating your ideal sleep environment, it’s a good idea to purchase a sheet set that comes with both types of sheets. This will give you the option to customize your sleep setup to fit you perfectly.

These are our top recommended choices for full sheet sets:

• Douglas Egyptian Cotton Sheets: These sheets take the classic feel and durability of cotton to the next level. Made with Egyptian 400-thread count cotton for a smooth look and feel, Douglas cotton sheets are also sturdy and long-lasting.
• Octave Bamboo Sheets: Octave’s bamboo sheets are ideal if you need help to sleep cool at night. These 300-thread count sheets are extra silky and cool to the touch, going the extra mile to stop you from overheating in bed.
• Logan & Cove Linen Sheets: These sheets are made with 100% European flax linen. They’re manufactured at 160 GSM for the perfect balance of softness, crispness, and breathability. Logan & Cove linen sheets are stonewashed, which means they’ll feel great right away, and soften up even more over time.