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The Serta iSeries NXG 3500 Hybrid Medium Split Head Queen Mattress combines cooling memory foams with a supportive foam core and a cool-to-the-touch cover. Its split-head design lets each sleeper adjust the head of an adjustable base independently, a feature usually found on higher-priced hybrids. The medium feel and pressure-relieving foams suit side and back sleepers who sleep hot, though the all-foam construction lacks the bounce of coil hybrids. Owners praise its cooling and motion isolation, but some note a strong initial odor and limited edge support compared to innerspring models.
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Reviewers generally appreciate the cooling cover and pressure relief, and couples with adjustable bases value the split head. Some complain about a strong smell that lingers for days and say edge support is softer than expected.
It combines high-density NXG memory foam with a supportive foam core for contouring pressure relief.
The CoolFeel cover is cool to the touch, so the surface feels cooler right away. Beneath it, carbon fiber memory foam contours as it cools. It relieves pressure and channels heat away from the body.
A high-density foam core is surrounded by Ultimate Edge Support, which gives stability from edge to edge.
