Wondering if the Casper Sleep Original Foam Mattress runs hot? Here's what we found. The manufacturer describes it as medium-firm, making it a good option for back and side sleepers. This level of firmness is supposed to provide a nice balance of comfort and support, which can help with spinal alignment and might even ease some back pain.
When it comes to staying cool at night, this mattress uses breathable foam layers to boost airflow. But according to our research, it might not meet the cooling needs of very hot sleepers. The foam helps a bit, but if you easily overheat, it may not be as effective as mattresses with coil layers, which usually offer better temperature regulation.
On the plus side, a lot of folks appreciate its zoned support system. This design is firmer where you need it—like under your hips—and softer around your shoulders, which helps with spinal alignment during sleep and could be a big win for minimizing back pain.
That being said, not everyone agrees on how firm it is. Some people love the balance of softness and support, especially those dealing with back issues, but others think it's a tad too soft. Comfort can really depend on personal preference, so if you're considering it, a trial period could help you decide.
In short, the Casper Sleep Original Foam Mattress works well for many, but if you tend to sleep hot, you might want to look into other cooling features.
Otherwise, its medium-firm design and zoned support seem to please a lot of sleepers looking for comfort across different sleep positions.
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How we researched this
Where this comes from: this answer draws on the product's published specifications and the reviews ShopSavvy collected for it, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen Oct 12, 2026.
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