Review published on January 7 2025 by Thomas Saunders, editor of elite sleep reviews.
The Casper One Mattress is one of the most well-known all-foam mattresses on the market and helped popularize the bed-in-a-box category. Designed to appeal to a wide range of sleepers, Casper aims to deliver balanced comfort, pressure relief, and support without feeling too soft or too firm.
In this review, we break down how the Casper One Mattress performs in comfort, firmness, cooling, support, motion isolation, edge support, durability, and overall value, so you can decide if it’s still a smart choice today.
How We Test Mattresses
Our reviews are based on firsthand, hands-on testing and real-world sleep experience. We evaluate mattresses using consistent criteria, including pressure relief, spinal alignment, motion isolation, temperature regulation, and durability. We do not use any fancy gimmicks, proprietary scoring systems, or manufacturer-provided ratings. Each mattress is tested the same way so comparisons are fair, transparent, and based on actual performance, helping readers make informed, trustworthy buying decisions. Read our full mattress testing methodology!
Check current pricing and availability for the Casper Mattress below.
🛏️ Quick Summary
- Best for: Side sleepers, combination sleepers, couples
- Not ideal for: Stomach sleepers, heavier sleepers
- Firmness: Medium (about 5.5–6/10)
- Mattress type: All-foam
- Sleep positions: Side, back, combination
- Trial & warranty: 100-night trial, 10-year warranty
🧠 Casper One Mattress Construction
The Casper One Mattress uses a three-layer all-foam design focused on balanced support and pressure relief.
Typical layers include:
- AirScape™ perforated foam for airflow and cooling
- Zoned memory foam to support the hips and lower back
- High-density base foam for structural stability
This design gives Casper its signature balanced, neutral feel rather than a deep memory-foam sink.
💤 Comfort & Feel
The Casper One Mattress feels moderately plush on top with gentle contouring that adapts quickly to movement. You’ll feel supported without feeling stuck, which makes it comfortable for people who change positions during the night.
What most sleepers notice:
- Light, responsive contouring
- Minimal “stuck” feeling
- Comfortable pressure relief at shoulders and hips
Casper’s comfort profile is designed to appeal to the average sleeper, rather than a specific niche.
If Casper’s balanced, medium feel sounds like a good fit, you can view current pricing directly from the brand here.
🧍 Firmness & Support
Casper rates around 5.5–6 out of 10, placing it squarely in the medium range.
How it performs by sleep position:
- Side sleepers: Very good pressure relief
- Back sleepers: Good support for average-weight sleepers
- Stomach sleepers: May feel too soft at the hips
- Combination sleepers: Easy to move on
Heavier sleepers may find it lacks long-term support compared to firmer foam or hybrid mattresses.
🌬️ Cooling & Temperature Regulation
Casper performs better than average for an all-foam mattress, but it’s not a standout cooling option.
Cooling features include:
- Perforated foam for airflow
- Open-cell foam structure
Hot sleepers may still retain some heat, especially compared to hybrids or latex-based mattresses.
🔁 Motion Isolation (Couples)
Motion isolation is very good, making Casper a solid choice for couples.
- Absorbs movement well
- Minimal transfer across the surface
- Quiet when changing positions
Couples who value uninterrupted sleep will appreciate this performance.
🔧 Edge Support
Edge support is average, which is typical for all-foam mattresses.
- Some compression when sitting
- Adequate support when sleeping near edges
- Less stable than hybrid or innerspring options
🪶 Durability & Longevity
Casper uses quality foams, but as an all-foam mattress, longevity depends on body weight and usage.
- Performs well for average-weight sleepers
- Softer foams may break in faster over time
- Heavier sleepers may see impressions sooner
For long-term durability, hybrids often hold up better.
🧾 Trial, Warranty & Policies
- 100-night sleep trial
- 10-year limited warranty
- Free returns within the trial window
Casper’s policies are standard but no longer industry-leading.
✅ Pros & Cons
Pros
- Balanced, neutral comfort
- Great for side and combination sleepers
- Good motion isolation
- Easy to move on
Cons
- Not firm enough for many stomach sleepers
- Average cooling performance
- Edge support is limited
- Higher price compared to similar foam beds
🧠 Casper One Mattress Final Verdict
The Casper One Mattress is a solid all-foam option for sleepers who want balanced comfort without extremes. It’s especially well-suited for side sleepers, couples, and combination sleepers who want gentle pressure relief and easy movement.
However, shoppers seeking firmer support, stronger cooling, or better long-term durability may find more value in alternatives like the Lull Mattress, Nectar Mattress, or a hybrid such as the Helix Midnight.
Casper remains a reliable choice — but it’s no longer the automatic recommendation it once was.
If you’ve decided the Casper Mattress is right for you, here’s where to check the latest availability and policies:
🔗 Helpful Next Steps
- Compare it in our Lull vs Nectar comparison
- See stronger all-foam picks in our Best Mattresses Buyer’s Guide
- Take the Find the Right Mattress Quiz
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