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I've slept on both of these beds across multiple test rotations, and the honest answer is: they're solving different problems. Purple built something genuinely unlike any other mattress on the market. Casper built a very good foam bed with smart zoning. Which one wins depends entirely on what's keeping you up at night.
If you want the full brand picture before deciding, I've got a detailed Purple mattress review that goes deeper on the grid technology. You can also check the mattress comparisons index for every head-to-head I've run, or see where both land in my best mattress of 2026 rankings.
Specs Side by Side
Here's the structural breakdown before I get into what those numbers actually feel like:
| Feature | Purple Original | Casper Original |
|---|---|---|
| Support Framework | 9.25-inch GelFlex Grid Hybrid | 10-inch All-Foam (Zoned) |
| Comfort Layer | 2-inch proprietary Hyper-Elastic GelFlex grid | AirScape breathable comfort foam layer |
| Temperature Control | Excellent (thousands of open air columns) | Good (breathable AirScape foam) |
| Trial Period | 100 Nights | 100 Nights |
What Actually Separates These Two Beds
Purple's GelFlex grid is not a marketing gimmick — I say that as someone who spent 11 years watching brands invent words for ordinary foam. The grid is a real polymer structure with thousands of open air columns that let heat escape while the walls buckle under pressure points like hips and shoulders.
Casper takes a completely different approach. It's a 3-zone foam system where the center third is firmer to keep your pelvis from sinking, and the shoulder zone is softer to let your arm drop in. I tested it over six nights with a back-pain-prone tester and the alignment difference was measurable in how they woke up.
The feel gap between these two is significant. Purple has a floating, slightly springy sensation that combo sleepers tend to love. Casper feels like a well-tuned foam bed — responsive enough, but it still has that slight hug that memory foam fans expect.
Performance Testing Scorecard
What's Actually Inside Each Mattress
Purple stacks a 2-inch GelFlex grid on top of a transition foam layer and a high-density support base. The grid does the heavy lifting — the layers underneath are mostly there to keep the grid stable and prevent bottoming out.
Casper runs a knit cover over AirScape perforated foam, then a zoned memory foam layer, then a firm polyfoam core. The perforations in the AirScape layer genuinely help with airflow — it's not just a name — but it still can't match the open-column structure of the Purple grid on a warm night.
Marcus spent 11 years managing mattress showrooms in the Midwest before switching to independent reviewing. He tests beds so you can skip the sales floor.
For more matchups like this one, the mattress comparisons index has every direct brand duel I've run. Or head back to the MattressSmartColumbus home to browse by sleep type, budget, or body weight.