Casper The One review

Casper The One is Casper's current entry-level flagship. If you're looking for the Casper Original, it is no longer sold, and The One is its all-foam replacement. Under a soft knit cover it layers Breathe Flex open-cell foam, Align+ memory foam and a high-density base. Testers rate it 7 out of 10, which is firm for a medium-firm label. In this Casper The One review, it stands out for back sleepers, combination sleepers and couples who want minimal motion transfer at a mid-range price.

Best for: Back sleepers · Combination sleepers · Couples

Feel and firmness of Casper The One

A 7 out of 10 sits at the firm end of medium-firm. You get a light cushion from the top foam and then firm, flat support. Memory foam adds some contouring, but this is not a deep-sink bed. Because Casper uses continuous support rather than zones, the whole surface feels the same, with no softer shoulder area.

Each layer has a job. Breathe Flex open-cell foam on top is meant to keep air moving, Align+ memory foam adds contouring, and the high-density Casper Core base provides the firm support. At 11" tall, it fits most frames and standard fitted sheets.

Best (and worst) sleeping positions

Back sleepers are the best match. A 7/10 keeps the hips up and the spine fairly neutral for most body weights. Combination sleepers who spend most of the night on their back do well too. Stomach sleepers under about 200 lbs often find it firm enough. Side sleepers are the weak spot. Heavier side sleepers may sink enough to be comfortable, but lighter side sleepers will likely feel pressure at the shoulders and hips.

Cooling, motion and edges

Motion isolation scores 5, the best result on our scale, so a partner's tossing barely reaches you. Cooling is a 3. Open-cell foam helps, but this is still an all-foam bed, so hot sleepers may want a hybrid. Edges are a 3, typical for foam, so expect some roll-off near the side.

Price, trial and warranty

Casper lists the queen at about $1,149 and often sells it for around $899. Tom's Guide listed an MSRP of $999 in 2025, so expect the price to shift. You get a 100-night trial and a 10-year warranty, which is standard but shorter than Nectar's or Leesa's.

At its sale price, compare The One with Nectar's Classic, which often costs less and has a longer trial. The One makes more sense if you want a little less firmness than Nectar's 7.5.

How it compares

Nectar's Classic is firmer, cheaper on sale and has a lifetime warranty. Read Casper vs Nectar for the details. The Tuft & Needle Original is the budget all-foam alternative, covered in Casper vs Tuft & Needle. If you want something softer for side sleeping, Leesa vs Casper points to a medium feel and a 365-night trial. It also appears in our best memory foam mattress guide.

Still weighing options? Our 60-second mattress quiz narrows the field by sleep position, body weight and budget.

Specs at a glance

Specs and prices checked Oct 7, 2026 from Casper’s site and independent reviews. They change: confirm before you buy. How we rate mattresses.

Head-to-head comparisons

• Casper vs Nectar (Nectar vs Casper): 2026 Verdict
• Casper vs Purple (2026): Which Mattress Should You Buy?
• Casper vs Tempur-Pedic (2026): Which Should You Buy?
• Casper vs Tuft & Needle (2026): Which to Buy?
• Leesa vs Casper (2026): Which Mattress Should You Buy?

Where it ranks

• Best value mattress for back sleepers - The Best Mattresses for Back Sleepers
• Best memory foam mattress for couples - The Best Memory Foam Mattresses

Similar firmness

Prices are approximate queen prices when we last checked and change often. Ratings are 1-5 from published specs and independent test results: see how we score.