Is the Serta Classic Blissville good for side sleepers?

Medium foam generally cushions shoulders and hips well for side sleepers of average weight. Heavier side sleepers may want a softer top layer or a hybrid for more give.

What does the three-zone design do?

The middle zone is firmer to keep the hips and lower back from sinking, while the head and foot zones are softer. It is a support feature, not an adjustable firmness setting.

Does it need a box spring?

An all-foam mattress like this works on a slatted frame, platform bed or adjustable base. A box spring is optional and mainly adds height.

How long does a foam mattress like this last?

Most foam mattresses last around 7 to 10 years with regular rotation. A heavier sleeper or a bed used every night may see softening sooner.

Is $659.99 a good price for a California King?

It is the only new price listed for this size as of November 8, 2026, so there is no recent range to judge it against. Compare it with other medium all-foam California Kings before deciding.