The Classic (c) line has the least cushion the Innovation (i) line has the most and the Performance (p) line falls somewhere in between. The Sleep Number mattresses are, with the exception of the Cooling Memory Foam (m7) bed, cushiony but not particularly contouring or extraordinarily plush. A majority of mattresses incorporate polyfoam, and the Sleep Number foam feels like the non-sinky kind used in the Tuft & Needle, a mattress we tested for our foam mattress guide.

We’re disappointed that Sleep Number doesn’t divulge the type or density of foam it uses, calling it only a “proprietary foam.” (If customers are spending thousands of dollars on your product, we think you should tell them exactly what they’re getting.) But with the exception of the memory foam in the Cooling Memory Foam ( m7) bed-which makes memory foam its selling point-we think the foam in Sleep Number mattresses is probably some sort of non-memory-foam polyurethane foam (also known as polyfoam). And the thicker the foam portion on top, the more expensive the mattress. There’s also a layer of foam cushion that surrounds the air chamber.

Queen bed frame for sleep number bed