Does the mattress come with the adjustable base?

Yes. The Renanim SF is sold as a set with a 12-inch cooling gel memory foam queen mattress included. You do not need to buy a separate mattress.

Can two people adjust each side separately?

The listing describes an electronic adjustable base but does not confirm dual-zone control. Ask the seller before buying if you and your partner want independent positions.

Is the cooling gel mattress good for hot sleepers?

Gel memory foam is designed to pull heat away, but foam still traps warmth for some sleepers. It is not as breathable as a latex or hybrid mattress.

What is the height of the bed?

The set has a 16-inch profile, with the 12-inch mattress on the adjustable base. Check that this height works with your nightstands and room layout.

Does it work with an existing headboard?

Adjustable bases usually need a headboard bracket or a compatible frame. Confirm with Renanim that your headboard attaches to this base.

How firm is the mattress?

Gel memory foam mattresses in this class are typically medium firm. The listing does not state a firmness rating, so ask the seller if you need soft or firm support.