Casper Cloud One Split King Mattress with Head Up Only Base

A split king is an ideal solution for couples with conflicting needs. Because it consists of two independent units, one partner can elevate the head of their mattress to read or reduce snoring without affecting the other. Furthermore, the physical separation provides superior motion isolation; the energy from a restless sleeper is not transferred across the bed, ensuring a deep, restorative night’s sleep for both partners.

One of the greatest practical advantages of a split king is its modularity. Unlike a standard king mattress, which can be difficult to navigate through tight stairwells, around sharp corners, or through narrow hallways in urban apartments and older homes, a split king is delivered as two separate Twin XL units. This makes the logistics of delivery and setup significantly simpler in homes with restricted access.

To ensure the mattresses can move independently, you will need two separate Twin XL fitted sheets. For the top layers, you can use a standard King-sized flat sheet and a single King comforter to maintain the cohesive aesthetic of a traditional King bed. We recommend choosing deep-pocket fitted sheets with reinforced elastic corners to ensure they stay firmly attached to the 11-inch thick mattress even when the adjustable base is in an elevated position.

Yes. This set includes the RTG Sleep 2900 adjustable base, which allows you to elevate the head of the mattress using a wireless remote. Raising the head can help open up airways to significantly reduce snoring and alleviate symptoms of acid reflux (GERD). This "head up" positioning is a professionally recommended method for improving sleep hygiene and respiratory comfort throughout the night.

While a minor center gap is inherent to the split design, it can be minimized through proper setup. Ensuring the two adjustable bases are flush and level is the first step. Based on our expertise with these systems, we also recommend using high-quality fitted sheets with strong elastic or specialized non-slip mattress pads to keep the two Twin XL units securely in place, maintaining a unified feel while still allowing for independent head adjustment.

This mattress is engineered with Casper Core cloud-like foam pillars designed to provide plush comfort without sacrificing structural integrity. The construction features thicker layers of premium comfort foam specifically positioned to cradle the body and provide targeted support to the hips, waist, and lower back. This ergonomic design helps maintain proper spinal alignment, which is essential for relieving pressure and chronic pain.