Testers lie down on the mattress topper and move across the surface while we use heat guns, pressure mapping tools, and VOC meters to test for temperature control, pressure relief, and off-gassing, respectively.We test each topper on a medium soft (4) mattress, a medium (5) mattress, a medium firm (6) mattress, and a firm (7) mattress to ensure well-rounded ratings. All mattress toppers we test in OneCare Media’s Seattle office undergo rounds of testing for several performance criteria.This diversity provides us with comprehensive and inclusive data on which we base our recommendations. Our testers vary widely in their sleep preferences and body types and have multiple years of experience testing mattress toppers.Our testing methodology guidelines include the following: Our extensive testing process ensures our product recommendations for toppers are as accurate as possible. Here at, we test all mattress toppers featured on our review pages in-house.
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