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

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…