Key Takeaways
- Flat sheets are primarily used on top of a fitted sheet and below a comforter or duvet.
- Fitted sheets are the bottom layer that directly covers and protects the mattress.
- It is recommended to use a fitted sheet as a layer between you and your mattress and a flat sheet between you and your comforter or duvet, but some sleepers prefer to make do without the latter.
When buying bed sheets, many wonder how flat and fitted sheets are different and if both are required. While both cover your bed, they have different purposes and use cases.
Whether it’s time to buy new sheets or you’re simply curious about your options, learning how to use flat and fitted sheets can help you sleep more comfortably.
Read on to learn more about the differences between flat and fitted sheets, when and where to use both types of bed sheets, and the benefits of using both.
A flat sheet — also known as a top sheet — is a type of non-fitted sheet designed to lie on top of the mattress.
Flat sheets are usually made from lightweight and breathable materials such as cotton, bamboo, linen, or microfiber. They come in different sizes to fit various mattress dimensions and are often sold as part of a sheet set that also includes a fitted sheet, pillowcases, and sometimes a duvet cover.
Flat sheets have a variety of uses beyond simply covering the mattress. They can be layered with other bedding to create warmth and texture or used alone as a lightweight covering during warmer months. They are also easy to wash and care for, making them a practical and versatile addition to any bedding collection.
Flat sheets can be layered with other bedding or used as a lightweight covering during warmer months. They also provide a soft layer between sleepers and their comforters or duvets, protecting the top layer of bedding from sweat and dead skin. This layer of protection may limit the need to wash the comforter or duvet as frequently.
Flat sheets are typically machine-washable and tend to be less prone to wrinkling than fitted sheets, making them a more practical choice for sleepers who prefer low-maintenance bedding.
A fitted sheet is a bed sheet designed to cling onto the corners of a mattress.
Unlike a flat sheet, which is simply draped over and tucked under the foot-end of the mattress, a fitted sheet has elastic corners that grip the mattress, holding the sheet in place and preventing it from slipping. This makes fitted sheets more convenient and less likely to become wrinkled or bunch up at night.
Fitted sheets are available in different sizes to fit all mattress sizes and depths. Common sheet sizes include twin, full, queen, and king sizes, as well as specialized sizes for extra-deep or extra-large mattresses. If you use a mattress protector or mattress topper, a fitted sheet also goes over these layers.
It’s important to choose the correct size fitted sheet to ensure a good fit. A sheet that is too small will not be able to cover the entire mattress. If your fitted sheet is too big for your mattress, the elastic corners won’t hold it in place, so it is more likely to become untucked overnight.
So what’s a fitted sheet used for? Fitted sheets are designed to protect your mattress and keep you comfortable. They have elastic corners that hug the mattress tightly, ensuring a secure and snug fit that stays in place throughout the night. This eliminates the need for constant readjustment and helps keep the bed looking neat and tidy.
Additionally, fitted sheets are designed to wrap around the mattress, making them a more effective option than flat sheets. They are also less likely to become tangled or twisted during use, reducing the need for frequent bedding maintenance.
Flat and fitted sheets are often made from the same types of material, but they aren’t always interchangeable. The differences between fitted and flat sheets are in how they’re used and designed as well as how you should wash and store them.
By design, fitted sheets are meant to be used as a bottom sheet, wrapping around the mattress to protect it from dust, dirt, and sweat. Similarly, the flat sheet is designed to lie on top of the mattress and fitted sheet but under a comforter or duvet.
Fitted sheets have one purpose and aren’t suited for other uses because of their distinct shape and design. Flat sheets are more versatile because of their simple rectangular shape.
You can use a flat sheet as a bottom layer by tucking all four corners under your mattress, but you can’t comfortably use a fitted sheet as a top sheet. If you use a flat sheet in place of a fitted sheet, make sure you research how to keep sheets on your bed, like using bed straps to keep them in place.
While flat sheets are perfectly rectangular in shape, fitted sheets have rounded corners with elastic to better fit around the corners of your mattress. Flat sheets may have a larger hemmed section on one side, indicating the direction the sheet should lie on your bed.
Fitted and flat sheets are commonly made with the same types of materials, and you can purchase sheet sets that come with uniform flat and fitted sheets as well as pillowcases. The comfort and feel of your sheets heavily depend on the type of sheets you buy, including cotton, Tencel, or bamboo.
Fitted and flat sheets are usually machine-washable, though you should check specific care instructions for the sheets you use. Over time, fitted sheets may wear out more than flat sheets because repeat washing and drying can reduce elasticity, affecting how snugly the sheet fits on your bed.
Fitted sheets are notoriously challenging to fold correctly. There are a few different ways you can fold a fitted sheet, but the rounded corners and elastic make it difficult to fold into a neat rectangle. It’s much easier to fold a flat sheet because of its simple shape and design.
When storing sheets, you can neatly stack folded flat sheets or wrap a matching fitted sheet around a folded flat sheet. Many people find the process of folding fitted sheets tedious and forgo it altogether. Even when folded, fitted sheets may be bulky and lumpy, which can take up more space and look messy.
Choosing between a flat sheet or a fitted sheet ultimately comes down to personal preference and specific sleep needs. Consider the following use cases to help you decide when you should use fitted and flat sheets.
In most cases, you should use a fitted sheet to keep your mattress clean, though you can use a flat sheet in a similar way. You should consider using a fitted sheet if:
Flat sheets are included in sheet sets but using them is optional. You may want to consider using a flat sheet if:
Bed sheets serve two basic purposes: Protect your mattress and keep you comfortable. If you’re not sure which sheets you should use on your bed, consider common advantages and disadvantages of each type.
Fitted sheets are largely beneficial but come with unique considerations due to their shape, features, and function.
Pros |
Cons |
Elastic corners keep them in place |
Notoriously challenging to fold |
Protects your mattress from dirt and damage |
Must match the mattress size exactly or it won’t fit |
Gives you a soft sleeping surface |
May require special care to preserve elasticity |
Less prone to wrinkling than flat sheets |
You’ll find flat sheets in most sheet sets, but some people choose not to use them. In addition to the use cases discussed above, weigh the pros and cons of flat sheets before deciding to use one.
Pros |
Cons |
Can be used as a top or bottom sheet |
Adds an extra step to making your bed |
Can be used as a lighter alternative to a comforter or duvet |
May slip out of place more often than a fitted sheet |
Helps keep your cover clean |
May get wrinkled more easily |
May help you regulate temperature |
At Purple, our bedding sets include a fitted and a flat sheet as well as pillowcases. The Purple SoftStretch® sheet set is made of a silky-smooth bamboo blend fabric that allows for maximum stretchiness and breathability.
If you enjoy a classic cotton feel, our Complete Comfort sheet set is made of a cotton and Spandex blend that feels soft and stretchy simultaneously.
FAQ
Flat sheets are primarily designed to provide an added layer of comfort between you and your duvet or comforter. You can also use a flat sheet as a lightweight, breathable blanket in warmer weather.
If you don’t want to use a fitted sheet, you can swap in a flat sheet and tuck the corners under your mattress to protect it.
A fitted sheet is a piece of bedding designed to cover the mattress, with rounded corners containing elastic used to keep it secure. Fitted sheets provide a comfort layer under you while also protecting your mattress from dirt, dust, and sweat.
Yes, it’s recommended to use both a fitted and flat sheet, but flat sheets are generally considered optional. It’s necessary to use a fitted sheet or other cover beneath you to protect your mattress from dirt, sweat, oils, and dust. Flat sheets offer similar benefits but some sleepers may prefer not to use them for various reasons.
Flat sheets can help keep bulkier bedding items clean. Some flat sheets are a good option if you sleep hot since they can create a breathable barrier between you and heavier bedding. In colder months, some flat sheets made from materials like flannel can help keep you warm. Ultimately, whether you use a flat sheet depends on your preferences.
Typically, yes. The intended purpose of a flat sheet is to lie between you and your top cover, whether it’s a blanket, comforter, or duvet. If you have a flat sheet on your bed as well as a fitted sheet, you will usually sleep between these layers.
Yes, you can use a flat sheet as a blanket. Because they’re thinner than regular blankets, flat sheets can be airier and less stifling. This makes them great for tropical climates or hotter seasons.
Yes, you can technically use a flat sheet as a fitted sheet, though it won’t be as secure as a fitted sheet and is not recommended for long-term use. To do this, you can use sheet clips or straps to keep your flat sheets in place.
Hotels use flat sheets instead of fitted sheets because they are easier to fit onto a hotel bed using hospital corners — a method of securely tucking in flat sheets with crisp folds, originating from 19th-century hospitals — and are simpler to launder and fold. The elastic on fitted sheets can also wear out and lose its stretch with repeated, high-temperature laundering, making them unsuitable for long-term use.