Is this mattress good for side sleepers?

Probably not. It is a firm mattress aimed at back and stomach sleepers, and side sleepers usually need more give at the shoulder and hip.

Will I feel my partner move at night?

Individually wrapped pocket coils respond separately, which is designed to cut motion transfer. Most couples should notice less movement than with a traditional connected-coil spring bed.

Does the gel layer really keep the bed cool?

The gel-infused layer and cool-touch cover are made to manage temperature, but no foam or gel layer actively cools a bed. Hot sleepers should treat the cooling claims as modest.

How firm is it compared with a medium mattress?

Noticeably firmer. It is built as a firm surface, so anyone used to a medium or pillow-top bed will find it much more supportive and less cushioned.

Do I need a box spring under it?

A 14-inch pocket-coil mattress works on a slatted bed frame, platform base or box spring. A solid, supportive foundation protects the coils and keeps the warranty valid.

The mattress ships compressed and rolled. Let it expand fully before sleeping on it, since a 14-inch coil mattress can take a day or more to reach full height.