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The Zinus Mainstays 8 is a low-profile full-size innerspring mattress sold as a mattress in a box. Pocket springs give it a medium feel, and a thin layer of gel foam adds cushioning on top of the tight top. At 8 inches it fits bunk beds, trundles, dorm rooms and guest rooms where a thicker mattress will not. It is a budget pick, so expect a basic spring build rather than the deeper foam layers and edge support of mid-range hybrids. Owners mostly call it comfortable for the money, but some report sagging and softening within a year or two.
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Lowest price we've seen: $148.00 on Nov 9 at Walmart. Tracked across 1 store since Nov 9.
With over 9,600 ratings averaging 4.2, most buyers describe it as a comfortable, affordable mattress that suits kids' rooms, guest rooms and bunks. The complaints that recur are sagging, softening over time and weak edges.
Built for compact sleeping spaces, this Mainstays Full innerspring mattress keeps a low 8-inch profile that suits setups like bunk beds, trundle beds, dorm rooms, and guest rooms. Its tight top design pairs firm support with a layer of gel foam for a cushioned feel, while the innerspring build creates a supportive surface without adding extra height. Because it arrives as a mattress-in-a-box, you can bring it into tighter rooms and get it in place before it settles. After unboxing, allow 24-72 hours for the mattress to fully expand.
