Is this mattress good for side sleepers?

Yes. The soft memory foam layer cushions shoulders and hips, which is what side sleepers usually need. Heavier side sleepers may want a firmer hybrid for more support.

Does it work for back or stomach sleepers?

Usually not. A soft surface lets the hips sink, which can strain the lower back. Back and stomach sleepers should choose a firm or medium-firm model.

What does reversible mean here?

You can flip the mattress and sleep on either side. That spreads wear and can slightly change the feel, so rotate and flip it on a schedule.

Will it fit a standard Twin XL frame?

Yes. It is built for Twin XL, the common dorm and adjustable-base size. Check your frame's weight limit, since a 12-inch hybrid is heavy.

Does it need a box spring?

No. A slatted base, platform bed or adjustable base works. Use a solid, supportive foundation rather than an old sagging box spring.

Is it hot to sleep on?

The cover is temperature-regulating and the pocket springs allow airflow, but memory foam still traps some heat. Hot sleepers should pair it with breathable bedding.