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

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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

Ultra Plush

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

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