California Design Den 600 Thread Count Split King Sheets, Cotton Sateen, Blue

Choosing sheets for an adjustable bed starts with the mattress layout: this set is made for a Split King with two separate Twin XL mattresses, rather than a single fitted sheet across the bed.

The five-piece set pairs one king flat sheet with two Twin XL fitted sheets and two king pillowcases, so each mattress has its own fitted layer.

Its blue, 100% long-staple cotton sateen has a smooth feel and a subtle sheen. The 600 thread count and breathable cotton make it a considered choice for everyday bedding across the seasons.

What you’ll notice day to day

Separate fitted sheets let the two Twin XL mattresses move independently as part of an adjustable-bed setup. Each fitted sheet has all-around elastic to help hold it in place, while top and bottom indicator tags make orientation easier when making the bed. The king flat sheet and two king pillowcases complete the coordinated set in a solid blue color.

The sateen weave gives the fabric a smooth, lustrous finish with a structured feel. Cotton is naturally breathable, making the set suitable for regular use through the year. The sheets are machine washable and can be tumble dried, so care fits into a familiar laundry routine. The fabric has also been tested for shrinkage, pilling, and fading.

At a glance

• Set: Five-piece Split King sheet set
• Mattress layout: Two separate Twin XL mattresses, not designed for top-split-only arrangements
• Material: 100% long-staple cotton
• Weave: Sateen, 600 thread count
• Color and pattern: Blue, solid
• Included: One king flat sheet, two Twin XL fitted sheets, and two king pillowcases
• Fitted sheet size: 39 × 80 inches, fits mattresses 8 to 15 inches deep
• Flat sheet size: 112 × 102 inches
• Pillowcase size: 21 × 40 inches
• Certifications and seals: OEKO-TEX STANDARD 100 and Good Housekeeping Seal

Maintenance

Machine wash warm and tumble dry on low. Removing the sheets promptly after drying can help reduce wrinkles. This straightforward care routine keeps the cotton set ready for regular bed changes, while the fabric’s testing for pilling, fading, and shrinkage supports its intended use as everyday bedding.

When it makes sense

This set is a practical match for a Split King adjustable bed with two separate Twin XL mattresses. Compared with a one-piece fitted-sheet approach, its two fitted sheets accommodate the separate mattress layout, while the shared king flat sheet keeps the bed dressed as one. The top and bottom tags are useful when changing sheets, and the all-around elastic helps each fitted sheet stay positioned on its mattress.

Choose it when you want the familiar feel of cotton with the smooth finish of sateen, coordinated blue bedding, and separate fitted sheets for an adjustable Split King setup. The defined five-piece configuration makes it easy to identify the right sheet arrangement for two Twin XL mattresses, with matching king-size pieces to finish the bed.