Both are split-head (flex-top) designs for adjustable beds, but they’re sized for different mattresses.

• King flex-top: Made for standard king mattresses; typically wider and a bit shorter.
• California King flex-top: Made for California king mattresses; typically narrower and longer.
• How to confirm: Check your mattress tag or measure length/width, then match the product title ("King Split Top" or "California King Split Top").
• What’s in the set: Product pages list fitted depth, split length, and pillowcase sizing so you can verify details.

Choosing the correct base size helps the split align with your bed’s head sections and may reduce shifting, though fit can vary by mattress and setup.

Split length is the distance from the top edge of the mattress to where the two head sections meet.

1. With the bed flat, measure from the very top edge down to the end of the head split.
2. Compare that measurement to the split length listed in the product title.
3. Common options on this page include approximately 28", 30", 32", 34", 36", and 39".
4. If your bed maker provides a spec, follow that guidance when selecting sheets.

Matching the split length can help your flex-top sheet move more smoothly with the adjustable head, but results may vary depending on mattress design and sheet construction.

Deep-pocket sizing relates to your mattress height.

1. Measure from the bed base to the top of the mattress, including toppers and protectors.
2. Choose a pocket depth that meets or slightly exceeds that number.
3. This page shows a range (about 12", 15", 18", 21", 24"+), making it easier to match.
4. If you’re between sizes, going a little deeper can ease fitting; very oversized pockets may feel looser.

Checking pocket depth alongside the split-top size helps flex top king sheets stay more secure without excessive tugging, though the exact feel depends on fabric and elastic design.

Here’s a simple way to fit a split-head (flex-top) sheet:

1. Align the split at the head so each side covers its adjustable half.
2. Secure the top corners first, easing fabric toward the hinge where the sections meet.
3. Anchor the foot corners next, then smooth fabric along the center seam.
4. Adjust the head sections slightly if needed, following your bed’s safety guidance—avoid forcing movement.
5. Check any sewn-in labels for "head/foot" or elastic straps and position accordingly.

These steps can help reduce slipping and bunching on adjustable beds, but fit may vary by mattress depth, split length, and the sheet’s design.

This page includes both full split-top king sets and stand-alone pieces.

• Separate fitted sheets: Look for titles that say "fitted sheet" for split head/flex king.
• Multi-piece sets: 4-piece and 6-piece sets typically include a fitted sheet, a flat sheet, and pillowcases; contents vary by item.
• How to spot them: Use site filters and read titles/descriptions for "split head," "split top," piece count, and pocket depth.
• Getting it fast: Delivery or store pickup may be available based on your ZIP code.

Availability can change, so reviewing the product page details is a good way to confirm what’s included before you buy.