Casper One Mattress

The do-everything Casper: zoned support, all foam

The Casper One is the brand's balanced, all-foam mattress, and Consumer Reports' top-rated all-foam mattress of 2026 (Consumer Reports does not endorse products). Eleven inches, a true 6-out-of-10 medium, built on Casper's signature zoned support: a buttery-soft knit cover, an open-cell Breathe Flex Foam top for airflow, Align+ memory foam for pressure relief, and a high-density Casper Core base. It is the bed designed to work for the widest range of sleepers without committing to firm or soft. If you have been stuck between a bed that is too hard and one you sink too far into, this one is built to land in the middle.

What "zoned support" actually means

This is the Casper idea worth understanding: the comfort foam isn't one uniform slab. It's tuned softer under your shoulders, so they sink in and your neck stays aligned, and firmer under your hips and lower back, where you need lift to keep your spine straight. Most foam beds give you one feel everywhere. The One gives your shoulders and your hips what each actually needs. Beneath it, the high-density Casper Core holds the medium feel and the bed's shape over years instead of dishing out in the middle. That is why it suits back, side, and combination sleepers at the same medium.

What you notice the first few minutes lying on it

Lie down on your back and the lower back fills in rather than bridging over a gap, because the firmer hip zone lifts you into a neutral line. Roll to your side and the shoulder drops while the hip stays supported, so your spine reads straight instead of bowing. There is no firm slab to fight when you move between positions, which is why a true medium is the easiest firmness to change positions on all night.

Who it suits, and who it doesn't

The One is the universal pick in the Casper line: back sleepers who want the lumbar held, side sleepers who need the shoulder to sink, combination sleepers who shift all night, couples, and first-time foam buyers. Casper reports that 92 percent of buyers keep their One past the trial, which is about what you'd expect from a true medium that refuses to be anyone's worst choice. Where the honesty comes in: if you already know you want a plusher, softer landing, the medium may read a touch firm, and the medium-soft Cloud One is the better call. If heat is your single biggest problem, the open-cell top helps but is not a dedicated cooling system, and the Casper Snow line is built for very hot sleepers. Naming that up front is how the Mattress Overstock floor works: associates are paid the same no matter which bed you choose, so the guidance points you to the right feel, not the priciest one.

One, Cloud One, or Dream?

The One is a true medium. If you want a softer version of the same zoned-foam idea, the Casper Cloud One takes it medium-soft, and side sleepers who want more give often prefer it. If you want coils for bounce, more airflow, and a firmer edge, the Casper Dream is the hybrid step: same family, wrapped coils instead of an all-foam core. The gaps are small in words and obvious under your own body. See the full Casper lineup.

Living with it over time

Because it is all foam, the One is quiet under motion: the layered foams absorb a turn before it crosses the bed, so a partner getting in late or shifting at 3 a.m. barely registers on your half. The open-cell Breathe Flex top moves air through the comfort layers instead of trapping it, so it sleeps cooler than the dense memory foam people remember from a decade ago, and at eleven inches it takes a standard fitted sheet.

Ten minutes beats ten reviews

Zoned support is a feel you have to lie down to understand: the way your shoulders drop while your hips stay up. The Casper One is on the floor across the five Mattress Overstock showrooms in Lexington, Richmond, Georgetown, London, and Somerset, set next to the Cloud One and the Dream so you can compare all three in one trip. The 100-night trial holds at full length buying from a local, authorized dealer, and delivery, setup, and old-mattress removal are free across Kentucky. Lie on it in Lexington this week, then select your size to see the live Mattress Overstock price.