Does a tight-top mattress add height?

A tight-top adds the least height of the three surface styles, because it has no separate cushioning layer stacked on top. The profile is determined by the core and integrated comfort layers alone, so the bed usually sits lower than a comparable pillow-top or euro-top. That can make standard fitted sheets easier to use and suits frames where a lower mattress height is wanted. Measure the actual profile if bed height matters for your setup.