California Design Den 840307193568 Split King Sheets, 600 Thread Count Cotton Sateen

The 600-thread-count cotton sateen weave gives these sheets a smooth feel and a subtle sheen for a more polished bed. The split king set pairs one king flat sheet with two Twin XL fitted sheets, so each mattress has its own fitted layer. Is your adjustable bed made with two separate mattresses? This set is designed for that layout, not a top-split mattress.

Size & fit

The two fitted sheets are made for separate Twin XL mattresses measuring 39" x 80" and fit mattresses 8" to 15" deep. All-around elastic helps hold each sheet in place, while top-and-bottom indicator tags make it easier to orient the fitted sheets when making the bed. The king flat sheet measures 112" x 102", and the two king pillowcases measure 21" x 40". Each pillowcase has a classic open end.

This configuration is useful when two people share an adjustable bed but need separate fitted sheets for its two mattresses. Instead of sourcing a flat sheet, two fitted sheets, and pillowcases separately, the five-piece set brings those pieces together in a coordinated True Ivory color. Check that your bed has two separate Twin XL mattresses, the set is not intended for a top-split-only mattress.

Why it’s worth it

Made from 100% long-staple cotton, the fabric combines a substantial, structured feel with the smooth surface of a sateen weave. Its soft sheen adds a refined look without changing the set’s practical role as everyday bedding. The breathable cotton is described as suitable for year-round use, so the sheets can stay in regular rotation across seasons.

The fitted sheets’ all-around elastic supports a secure fit, and the orientation tags help simplify bed making. For shoppers choosing between a ready-matched set and individual pieces, this set provides the key layers for a split king arrangement in one package. It has a Good Housekeeping Seal and OEKO-TEX STANDARD 100 certification, the fabric is also tested for shrinkage, pilling, and fading.

Technical details

• Type: 5-piece split king sheet set
• Material: 100% long-staple cotton
• Weave: Sateen
• Thread count: 600
• Color: True Ivory
• Fitted sheet size: 39" W x 80" L each
• Mattress fit: Two separate Twin XL mattresses, 8"–15" deep
• Flat sheet size: 112" W x 102" L
• Pillowcases: Two, 21" x 40"
• Care: Machine wash warm, tumble dry low. Remove promptly to help reduce wrinkles.

Final verdict

For a split king adjustable bed with two separate Twin XL mattresses, this set brings together the right sheet arrangement with 100% cotton sateen, a smooth hand feel, and a subtle luster. Its two fitted sheets, king flat sheet, and two pillowcases make it a practical choice for refreshing the whole bed in True Ivory, while the tags and all-around elastic help with everyday setup.