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The supportiveness of the mattress surface, ranging from extra firm for maximum support to ultra plush for a softer, cushioned feel.

Mattress Comfort Level

The internal components and support system of the mattress, like innerspring, memory foam, or hybrid.

Mattress Construction

The style of the mattress's uppermost comfort layer, such as a pillow top, euro top, or tight top.

Mattress Top

A mattress designed to be flipped over regularly to promote even wear and tear to extend its lifespan.

Double Sided Mattress

The overall measurement of the item from the floor to its highest point (how tall the item is).

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Serta® iSeries NXG™ 13.5" Memory Foam 4500 Ultra Plush Smooth Top Twin XL Mattress

Experience a series of benefits delivering immediate cooling, instant pressure relief, and ideal support for a deeper, more restful sleep at a price that makes sense. Featuring high-density memory foam, NXG memory foam for deep, contouring pressure relief.

Serta® iSeries NXG™ 13.5" Memory Foam 4500 Ultra Plush Smooth Top Queen Mattress

Serta® iSeries NXG™ 13.5" Memory Foam 4500 Ultra Plush Smooth Top Full Mattress

Serta® iSeries NXG™ 13.5" Memory Foam 4500 Ultra Plush Smooth Top King Mattress

Serta® iSeries NXG™ 13.5" Memory Foam 4500 Ultra Plush Smooth Top California King Mattress

Serta® iSeries NXG™ 13.5" Memory Foam 4500 Ultra Plush Smooth Top Split Head Queen Mattress

Serta® iSeries NXG™ 13.5" Memory Foam 4500 Ultra Plush Smooth Top Split Head King Mattress

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Ultra Plush

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SAVEUPTO$500^*on select mattress sets