What is a split king adjustable base?
A split king is two twin XL adjustable bases side by side under one king-width setup, so each sleeper controls their own half. One person can sit up to read while the other lies flat, with no compromise. It is the most popular adjustable option for couples for exactly that reason. The trade-off is that you need two twin XL mattresses rather than one king, and there is a centre seam, which a mattress topper or special sheets can bridge.
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