The 12" memory foam mattress that I just got can't be trimmed. It has a permanent, bound cover just like a regular mattress. It comes compressed in a box about 3'x2' weighs 75 lbs. When you cut the plastic wrap it expands over 24 to 72 hours. I like it as well as the home latex foam mattress that cost $2200.00 A topper can be trimmed.
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