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The SIMENMAX is a 3-inch tri-fold mattress topper built on gel memory foam over a support base foam, with a washable zip-off cover and a non-slip bottom. It folds into three sections so it can serve as a portable bed, play mat, lounger or spare seat, and the foam is CertiPUR-US certified. At 3 inches it is a topper rather than a full mattress, so it suits guest sleeping, camping and dorm use more than nightly back support. Against thicker tri-folds it packs smaller and costs less bulk, but offers less cushioning over hard floors.
In stockSold by Lilymont IncReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Ratings average 4.2 out of 5 from 23 buyers. Most praise the fold-up convenience and the washable cover for occasional sleeping; the main complaints concern thinness and firmness.
This is a 3-inch tri-fold memory foam mattress in a single size. It unfolds flat to use as a bed. You can also fold one or two sections to use it as a play mat, lounger, sofa or extra seat. It folds and unfolds in seconds and stores easily in cabinets or tight spaces.
The top layer is gel memory foam, which regulates temperature. A support base foam gives full body support. The feel is medium firm and conforms to the body for pressure relief. The memory foam is CertiPUR-US certified.
The cover is made of skin-friendly, breathable fabric. A center zipper lets you remove the cover and machine wash it. The non-slip bottom fabric keeps the mattress from moving on the floor. It can be used at home, in a tent, in a car, in an RV, or in a dorm or apartment.



















