Casper The One vs Serta iComfort Standard 12" Medium
Detailed side-by-side comparison — pricing, specs, performance ratings, and our pick.
| Feature | Casper The One | Serta iComfort Standard 12" Medium |
|---|---|---|
| Overview | ||
Type | Memory Foam | Memory Foam |
Firmness 1 = softest, 10 = firmest | 6.5 / 10 | 6 / 10 |
Queen Price Current / sale price | $799 | $1,599 |
Trial Period Return window | 100 nights | 100 nights |
Warranty | 10 years | 10 years |
| Performance Ratings | ||
Cooling Hot sleepers | Moderate | Good |
Motion Isolation Partners, light sleepers | Excellent | Excellent |
Pressure Relief Hip/shoulder pain | Good | Good |
Edge Support Sit/sleep near edge | Fair | Fair |
Durability Long-term performance | Good | Good |
| Compatibility & Features | ||
Adjustable Base Head/foot elevation | ✓ Yes | ✓ Yes |
Split King Support Two Twin XL per couple | ✓ Yes | ✓ Yes |
Dual Comfort Zones Different firmness per side | — | — |
Smart Features App, sensors, auto-adjust | — | — |
Financing | Affirm | Affirm |
| Materials & Safety | ||
Certifications Organic / non-toxic | CertiPUR-US | CertiPUR-US |
Off-Gassing New-foam smell concern | CertiPUR-US certified foam | CertiPUR-US certified foam |
| Best For | ||
Ideal sleeper profiles |
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| Actions | ||
Need Help Deciding?
For most sleepers, we recommend the Casper The One over the Serta iComfort Standard 12" Medium. It scores higher in price-to-value and delivers stronger overall value. The Serta iComfort Standard 12" Medium is the better choice only if you sleep hot and cooling is your top priority.
Casper The One vs Serta iComfort Standard 12" Medium: What Actually Differs
Both the Casper The One and Serta iComfort Standard 12" Medium are memory foam mattresses, so the real differences come down to firmness tuning, performance ratings, and price rather than construction type. The Serta iComfort Standard 12" Medium stands 12" tall versus 11" for the Casper The One — a 1.0" gap that matters if you need deep-pocket sheets or are pairing with an adjustable base. Both sit at roughly 6.5/10 on the firmness scale — a medium-firm feel — so neither one is the answer if you need a dramatically different support level. The single largest performance gap is in cooling: the Serta iComfort Standard 12" Medium rates noticeably higher than the Casper The One, which is the deciding factor if that dimension is high on your list. On a Queen, the Casper The One runs $799 versus $1,599 for the Serta iComfort Standard 12" Medium — roughly $800 (50%) less, which is enough to factor into the decision unless the pricier model wins clearly on the specs you care about.
Which Is Better For Your Sleep Style?
Both rate the same for pressure relief — choose on firmness instead (side sleepers usually prefer the softer of the two: Serta iComfort Standard 12" Medium at 6/10).
Firmness of 6/10 is closer to the medium-firm sweet spot back sleepers need for lumbar support (vs 6.5/10).
Firmer at 6.5/10 vs 6/10 — stomach sleepers need the extra support to keep the pelvis from sinking and arching the lower back.
Stronger cooling rating, which matters most for sleepers who run hot or live in warm climates.
Durability and edge-support ratings are equivalent — either holds up.
Softer at 6/10 vs 6.5/10 — lighter sleepers compress less, so they typically need the softer of two options to get proper contouring.
Motion isolation rated the same on both — neither has a transfer-disturbance edge.
Price Comparison (Queen)
| Mattress | MSRP | Current | Sale? |
|---|---|---|---|
| Casper The One | $999 | $799 | Save $200 |
| Serta iComfort Standard 12" Medium | $1,599 | $1,599 | At MSRP |
The Casper The One is the budget choice at $799 — $800 less than the Serta iComfort Standard 12" Medium ($1,599). That's a 50% gap, which is worth weighing against the spec differences before deciding which delivers better value for your situation. Only the Casper The One is on sale right now.
Casper The One
Strengths
- ✓Three-layer foam build with Casper Core support
- ✓Strong motion isolation for an all-foam bed
- ✓Split King is sold from the PDP
Considerations
- —No coil edge feel
- —No active Snow cooling package
- —Medium-firm feel is less plush than Cloud One
Serta iComfort Standard 12" Medium
Strengths
- ✓Current iComfort Standard medium profile with manufacturer-published 12-inch height
- ✓Graphite-infused Perfect Conform memory foam is designed to redistribute heat
- ✓All-foam construction is designed to minimize partner motion
- ✓Free shipping and returns are published on the current Serta PDP
Considerations
- —Twin and split sizes are not sold on the checked Serta PDP
- —Foam edge support is less robust than Serta's coil and hybrid lines
- —Most orders arrive through scheduled delivery rather than immediate parcel delivery