Is the Royal Park good for side sleepers?

It is a firm mattress, so most side sleepers will find it too hard on the shoulders and hips. It suits back and stomach sleepers better.

The knit cover is designed to wick moisture away, and the open coil core lets air move through. It is not a gel-infused foam mattress, so it does not rely on phase-change cooling.

Sealy describes the open coils as providing a firm feel. Expect a traditional firm spring mattress with a thin layer of gel foam cushioning on top.

Does it need a box spring?

It is an innerspring mattress, so a supportive foundation or box spring is the usual pairing. A slatted bed base with close slats also works.

What are its dimensions?

It measures about 59.75 by 79 inches and 12 inches tall, and weighs about 58 pounds. Check that against your bed frame before ordering.

How does it compare with a hybrid mattress?

It has open coils and gel foam rather than individually wrapped coils and thick foam layers. That means more bounce and edge support but less motion isolation and contouring.