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The Serta Sleeptrue Firm is a 6-inch twin memory foam mattress sold compressed in a box. It has three layers: a breathable fabric cover, a Pillow Soft Aire foam layer, and a gel-swirled memory foam over a dense foam core for edge-to-edge support. The thin profile is built for bunk beds, trundles, day beds and guest rooms rather than as a primary adult bed. Against thicker boxed mattresses it trades depth and plushness for a low, firm, space-saving build, and it carries a 100-night trial, CertiPUR-US certification and a 10-year limited warranty.
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This is a 6-inch twin memory foam mattress with a firm feel. It has three layers and a tight top. The top layer is memory foam swirled with cooling gel, which is meant to improve airflow, release heat and contour to the body.
A Pillow Soft Aire foam layer adds cushioning and airflow. A Serta Foam Core at the base gives support from edge to edge. The cover is a soft, breathable fabric blend.
The mattress works with bunk beds, trundle beds and day beds. It ships compressed in a box. Unroll it and let it expand, which can take up to 72 hours. It may need one to two weeks to air out.
