This Casper memory foam mattress performed very good in side-support tests, which look at the alignment of the spine, and performed very good in back-support tests, which analyze how well 36 points on the torso are supported. In the durability test, which analyzes the mattress's change in firmness, sag, and damage over a period of up to 8 years of simulated use, this mattress performed excellent, showing only minor changes in performance. It proved to be very stable, limiting the amount of vibration transmitted. In testing, its surface conformed to all shapes. We measured the mattress's firmness to be medium.
