Split King Adjustable Bed Sheets

On this page (7 sections)

1. Which split king adjustable bed sheets fit your bed?
2. How can you tell a standard split king from a flex top king?
3. What should a standard split king sheet set include?
4. How deep should split king fitted sheets be?
5. Will split king sheets stay on while the bed moves?
6. What should you check before ordering split king sheets?
7. Choose sheets by the mattress split and depth

Split king adjustable bed sheets usually mean 2 Twin XL fitted sheets and one shared flat sheet, because a standard split king has 2 separate mattresses. If your bed has one king mattress that splits only at the head, choose a flex top sheet set instead.

The bed's split style matters more than the word “king” on the package. Check whether you have 2 separate mattresses or one flex top mattress, then compare the fitted sheet size and pocket depth with your mattress setup.

Which split king adjustable bed sheets fit your bed?

For a standard split king, choose 2 fitted sheets sized 39 x 80 inches each for Twin XL mattresses. For a flex top king, choose one fitted sheet with a matching split at the head.

A standard split king setup pairs 2 Twin XL mattresses side by side. Each side can move separately, so two fitted sheets let the fabric stay with its own mattress as it adjusts.

A flex top king is different: it has one king mattress with a split near the head, while the lower part stays joined. The fitted sheet needs a matching split at the top, rather than two separate fitted pieces.

If you're unsure which style you have, look at the mattress itself and where the joint runs. Our guide to king versus split king adjustable beds explains the size and layout differences.

How can you tell a standard split king from a flex top king?

A standard split king has 2 separate mattress halves from head to foot, while a flex top king has one mattress with a split near the head. Match the sheet configuration to that seam.

Look at the surface of the bed with the mattresses flat. Two separate mattresses with a center gap indicate a standard split king; one continuous mattress with a short split at the top points to a flex top design.

The CGK Flex Top Split King Sheet Set is made for the second layout. Its fitted sheet measures 78 x 80 inches and has a 34-inch split down the top middle, so it is not the same configuration as two separate Twin XL fitted sheets.

The set includes a flat sheet and 2 pillowcases. Its fitted sheet is designed for mattresses 14 to 16 inches deep.

Before ordering, check the mattress size and split length. A flex top sheet that fits the king dimensions can still be wrong if its head opening doesn't match the mattress split.

What should a standard split king sheet set include?

A standard split king sheet set should include 2 fitted sheets sized 39 x 80 inches, plus a shared flat sheet if you use one. Pillowcase quantity varies, so check whether you need 2 or 4.

The CGK Split King 7-Piece Sheet Set has 2 fitted sheets, one flat sheet and 4 pillowcases. Its fitted sheets are 39 x 80 inches and fit mattresses up to about 16 inches deep.

This set may suit a couple that uses 4 pillows. Its pocket depth is 16 inches, so compare that with your mattress and any topper.

For a smaller set, the CGK Split King 5-Piece Sheet Set includes 2 fitted sheets, a flat sheet and 2 pillowcases. The fitted sheets are also 39 x 80 inches and fit mattresses up to about 16 inches deep.

Both standard sets use separate fitted sheets that can move with their respective mattress halves. If you're comparing bases as well as bedding, see our guide to the best split king adjustable beds.

How deep should split king fitted sheets be?

Choose a pocket depth that covers the mattress, protector and topper together, with enough fabric to tuck underneath. Measure the full stack before buying.

A fitted sheet can match the mattress length and width but still be too shallow for a thick mattress or added topper. Measure from the bottom edge to the top surface, including any protector or pad you leave on the bed.

The CGK standard split king sets fit mattresses up to about 16 inches deep. The CGK Extra Deep Split King Sheet Set has 39 x 80 inch fitted sheets with 21-inch pockets and stretchable elastic.

CGK Unlimited says the extra deep set fits mattresses 18 to 24 inches deep. It also includes 4 pillowcases and a 113 x 102 inch flat sheet, so compare its fit range with your complete mattress stack.

Will split king sheets stay on while the bed moves?

Correct dimensions and suitable pocket depth help fitted sheets stay in place, but mattress movement and sheet tension affect the fit. Secure each fitted corner and check the sheets again after adjusting the head or foot.

On a standard split king, each fitted sheet follows one mattress half. A flat sheet spans both sides, so it may shift when one side rises; separate blankets can give each sleeper more control over their own bedding.

On a flex top king, the head split lets the upper mattress sections move while the lower area remains joined. The fitted sheet's opening needs to match the split, and excess fabric around that opening can bunch when the bed changes position.

If you are choosing the base too, our split king adjustable bed review covers a specific split king model. Confirm that your mattress and sheets match the base's layout.

What should you check before ordering split king sheets?

Check mattress layout, fitted sheet dimensions, pocket depth and pillowcase count before you order. These details tell you whether the set fits the bed and includes the pieces you need.

Use this quick checklist:

• Mattress layout: two separate Twin XL halves or one flex top king.
• Fitted sheet count: 2 sheets for a standard split king or 1 flex top sheet for a split head mattress.
• Fitted dimensions: commonly 39 x 80 inches per Twin XL half, or 78 x 80 inches for the flex top set here.
• Pocket depth: measure the mattress with its protector and topper.
• Set contents: confirm how many pillowcases come with the set.
• Care instructions: check that the washing method works for your household.

The four sets in this guide use microfiber and are machine washable. Their main differences are the split configuration, pocket depth and number of pieces.

Choose sheets by the mattress split and depth

Choose 2 Twin XL fitted sheets for a standard split king adjustable bed, or a flex top set for one king mattress that splits near the head. Then match pocket depth to the full height of your mattress and topper.

For a standard set with 2 pillowcases, consider the CGK Split King 5-Piece Sheet Set. Choose the CGK Split King 7-Piece Sheet Set for 4 pillowcases, or compare the CGK Extra Deep Split King Sheet Set's fit range with a thicker mattress stack.

If you still need to choose the bed layout, start with king versus split king adjustable beds. It can help you confirm which sheet style belongs on your setup.

Frequently asked questions

Do split king adjustable beds need special sheets?

A standard split king needs 2 Twin XL fitted sheets because it has 2 separate mattresses, with a shared flat sheet if you want one. A flex top king has one mattress that separates near the head, so choose a fitted sheet with a matching head split.

Are split king sheets the same as Twin XL sheets?

The fitted sheets in standard split king sets measure 39 x 80 inches, the common Twin XL mattress size. These sets combine 2 fitted sheets with a shared flat sheet and 2 or 4 pillowcases, while a flex top set uses a different fitted sheet.

Can I use regular king sheets on a split king bed?

A regular king fitted sheet covers both halves together, so it isn't suited to letting each Twin XL mattress move separately. A shared king flat sheet may work if it is large enough, but choose 2 Twin XL fitted sheets for a standard split king.

How deep should split king fitted sheets be?

Choose pocket depth based on the full height of the mattress, protector and topper together. The standard sets here fit up to about 16 inches; CGK describes the extra deep set's 21-inch elasticized pockets as fitting mattresses 18 to 24 inches deep, so measure your complete setup.