Sealy Posturepedic Castle Rock Split King Mattress With Head Up Only Base
SKU: 5912920P
The Sealy Posturepedic Castle Rock Medium EPT mattress delivers pressure-relieving comfort to help maintain natural body alignment and reduce nagging Bed Aches night after night. The orthopedic-inspired Posturepedic Plus Support System features exclusive PrecisionFit Coils, arranged right where you need them. Plus, the DuraFlex Coil Edge provides a reinforced solid surface that's built to last. Conveniently raise or lower the head of your mattress using the RTG Sleep 2900 adjustable base with wireless remote control.
Features
Adjustable / Innerspring
Collection
Castle Rock
Warranty
10 year limited warranty -
Code P3 - 10/10 -
View Warranty20 year limited warranty -
Code P3 - 10/10 -
View WarrantyQ&A answers generated with AI assistance.
What is the best way to clean and maintain this mattress?
Based on our expertise with high-quality Sealy Posturepedic materials, we recommend regular vacuuming to keep the surface free of allergens and dust. For minor stains, a light application of mild soap and water is recommended; however, you should avoid soaking the fabric. To protect your investment and maintain the "Medium EPT" (Euro Pillow Top) comfort layer, we strongly suggest using a breathable mattress protector, which also aids in temperature regulation.
What makes this innerspring mattress durable enough for an adjustable base?
Not all innerspring mattresses are designed for movement, but this mattress features the Posturepedic Plus Support System with exclusive PrecisionFit Coils. These coils are engineered to be flexible yet supportive, maintaining their structural integrity even as the base articulates. To further enhance durability, the DuraFlex Coil Edge provides a reinforced, solid surface around the perimeter, preventing sagging and ensuring the mattress remains securely in place during adjustments.
Why choose a split king over a standard king mattress?
A split king is the ultimate solution for couples with different sleep preferences or schedules. Because this mattress set consists of two independent Twin XL mattresses, each person can adjust their side without disturbing their partner. This setup is particularly effective at isolating motion, ensuring that if one person tosses, turns, or gets out of bed, the other remains undisturbed.
How do I prevent the two mattresses in this split king set from sliding apart?
To minimize the "gap" between the two mattresses, this set is designed with a DuraFlex Coil Edge that helps the mattresses sit flush against each other. For a more secure fit, we recommend using a non-slip mattress pad or a specialized split king sheet set. These sheet sets typically include two Twin XL fitted sheets and one unified King flat sheet, which helps keep the two mattresses anchored together while still allowing for independent movement.
How does the "Head Up Only" adjustable base help with issues like snoring or acid reflux?
This mattress set includes the RTG Sleep 2900 adjustable base, which allows you to precisely elevate the head of the bed via a wireless remote. Elevating the torso is a proven method to help open airways and reduce snoring. Additionally, for those who experience acid reflux or GERD, keeping the head slightly inclined uses gravity to prevent stomach acid from rising, leading to a more restful and pain-free night.
Is this mattress set a good option for couples where one person likes to read or watch TV in bed?
Absolutely. The "Head Up Only" functionality is ideal for lifestyle activities like reading, using a laptop, or watching television. One partner can remain in a flat, sleeping position while the other raises the head of their mattress to a comfortable upright angle. This level of personalization eliminates the need for propping up pillows and helps maintain natural body alignment, reducing neck and back strain.
Will this adjustable mattress and base fit inside my existing bed frame?
This set is designed to be compatible with most standard king-size bed frames. The mattress dimensions are 80"L x 76"W, and the adjustable base has a slim 4-inch profile. However, we recommend checking the internal clearance of your specific frame, especially if it has built-in storage drawers or fixed slats, to ensure the motorized base can operate without obstruction.
80"l x 76"w x 15"h; adjustable base: 4"h

