I Test the World's Best Firm Mattresses — 5 I'd Buy in the Labor Day Sales

A woman sits on the edge of Plank Firm Mattress on a bed frame in a bedroom, demonstrating the excellent edge support of this mattress. A Tom's Guide price drop deals graphic in the bottom right corner

(Image credit: Future)

The Labor Day sales are upon us and although Labor Day itself isn't until next Monday, many deals are already live. As a mattress tester and long-term sufferer with lower back pain, I'm always on the hunt for the best firm mattresses to help deal with this, so I've put together five of the best deals you can pick up today.

Some of the best mattresses of 2025 have been heavily discounted for the Labor Day mattress sales but with such a major sale, there are a lot of offers to wade through. That's why I've done the hard work for you and picked out mattresses that can offer superior support and a true firm feel, making them strong choices not only if you suffer from back pain but also if you tend to sleep predominantly on your side or your back. Let's look more closely at the deals...

The 5 best firm mattresses to buy in the Labor Day sales

1. Saatva Classic Mattress: twin was $1,399 now $999 at Saatva
We rate the Saatva Classic as the best hybrid mattress you can buy, with options to suit a wide variety of sleepers. In our Saatva Classic mattress review, our testers trialed the Luxury Firm option, which will suit lighter weight sleepers looking for a firmer feel, but there’s also a Firm option for those weighing more or who sleep on their stomachs. For me, the Saatva wins out thanks to its patented lumbar crown, which provides extra support for the lower back. Our exclusive Saatva Labor Day sales discount gives you $400 off all sizes, taking a queen down from $2,139 to $1,739. And you'll also get a 365-night trial, lifetime warranty, and free white glove delivery that includes removal of your old mattress and foundation.

2. Plank Firm mattress: twin was $749 now $509.32 with TOMS32 code at Brooklyn Bedding
The all-foam Plank Firm by Brooklyn Bedding is a flippable mattress, offering a firm side (8/10) and an extra firm option (10/10). Modelled on the minimalist beds found across Asia, the mattress is endorsed by the American Chiropractic Association. In our Plank Firm mattress review, we rated the mattress as the best firm mattress you can buy, as well as one of the best mattresses for stomach sleepers. Our exclusive code TOMS32 will snag you 32% off at Brooklyn Bedding, taking a queen down to $905.76 (MSRP $1,332). You'll also get a 120-night trial, lifetime warranty, free shipping and there's the option to upgrade to a GlacioTex cooling cover.

3. Helix Twilight mattress: twin was $998.66 now $729.03 with TOMS27 code at Helix Sleep
The Helix Twilight is an unusual mattress in that it's a firm mattress that's been designed for side sleepers. I tested the mattress myself and in my Helix Twilight mattress review, I noted that it does, in fact, do what it says on the tin. There's fantastic pressure relief for side sleepers but we wouldn't recommend it to any other sleeping style. Our exclusive TOMS27 discount code gives 27% off all sizes of the Helix Twilight, meaning you can pick up a queen for $972.36 (MSRP $1,332). Extras include a 100-night trial, lifetime warranty and free shipping — you can pay extra to upgrade to white glove delivery.

4. Siena Memory Foam mattress: twin was $453 now $179 at Siena
The top recommendation in our best cheap mattress guide, the Siena Memory Foam mattress offers superb performance for an incredibly reasonable price. In our Siena Memory Foam mattress review, we rated the mattress at 9 out of 10, making it an extremely firm bed that's a great option for firm mattress lovers on a budget. The mattress is never sold at full price, and a queen usually retails for $359 (MSRP $749) so you don't actually need to wait for a sale to pick it up. Still, it's an absolute bargain this Labor Day and you'll also get a 180-night trial, 10-year warranty and free shipping.

5. Stearns & Foster Estate mattress: twin long was $2,299 now $2,099 at Stearns & Foster
Coming in at 9/10 (there are also medium and soft models, plus pillow tops in firm and soft options), the Stearns & Foster Estate is a luxury mattress offering superb comfort levels. In our Stearns & Foster Estate mattress review, our testers praised the mattress for its excellent support and pressure relief, along with great temperature regulation that will make it a godsend for hotter sleepers. Labor Day discounts mean you can pick up a queen for $2,199 (MSRP $2,399) and you'll also get a free bedding bundle thrown in. The mattress also comes with a 90-night sleep trial, 10-year warranty and free white glove delivery.

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Jo Plumridge is an experienced mattress reviewer with several years' experience covering all things mattresses and sleep, and who tests memory foam, hybrid and organic mattresses. What Jo doesn't know about a boxed mattress isn't worth knowing, so naturally we tasked her with producing a series of features for Tom's Guide looking at all aspects of mattresses, from how to pick between latex and memory foam (it's a tricky one), to the seven mistakes people make when buying a mattress for the first time. When testing the DreamCloud Luxury Hybrid for Tom's Guide, Jo said: "I loved the back support and pressure relief it offered. Plus, it looks far more expensive than it is." When she isn’t writing about sleep, Jo also writes extensively on interior design, home products and photography.

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