What does tight-top mattress mean?

Tight-top means the mattress surface is a single, taut top with the comfort materials integrated into the bed, as opposed to a pillow-top or euro-top that adds a distinct cushioning layer. The phrase refers to how the top is finished: smooth and flat, with no puffed or flush-sewn pad. It tells you the build style, not how soft or firm the bed is. Firmness still depends on the foams, fibres, and core beneath the taut cover.