Type: All-foam
Firmness: Medium-Firm
Height: 12"
Sizes: 4 (Twin XL-King)
Sleep trial: 100 nights
Warranty: 10 years
Price (on sale): $399.99 in a queen at SweetNight
Type: All-foam
Firmness: Firm
Height: 10"
Sizes: 7 (Twin-Split king)
Sleep trial: 180 nights
Warranty: 10 years
Price (on sale): $329 in a queen at Siena Sleep
The SweetNight CoolNest Mattress and the Siena Signature Mattress are two all-foam beds that deliver excellent temperature regulation for under $400 in a queen size. However, as a side sleeper, I know which cooling mattress I'd pick when choosing between the SweetNight CoolNest vs the Siena Signature.
The Siena Signature currently ranks as our favorite budget option in this year's best mattress guide, but after testing it through summer heatwaves, we now see the CoolNest as its biggest rival. While there's little doubt that both can keep us sleeping cool, which one will have side sleepers feeling comfy?
If you're a side sleeper looking for a budget memory foam mattress, this SweetNight CoolNest vs Siena Signature comparison guide will explore the two beds in terms of price, design, and comfort, so you can make an informed decision in this month's mattress sales.
The 12" SweetNight CoolNest and the 10" Siena Signature are both featured in our 2026 best cheap mattress guide, with each model regularly sold under $400 in a queen and both coming with good benefits.
Right now, the SweetNight CoolNest and Siena Signature are at their typical sale prices. 99). 99 (for both a twin XL and full size) but be aware twin and Cal king are both regularly sold out.
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