Is your mattress too soft? These seven practical fixes — from a firmer foundation to a quality topper — can add support and extend your bed's life before you spend money on a replacement.
A mattress that's too soft can leave you sinking in the middle, waking up with a sore back, or feeling like you never quite get supported through the night. The good news: you don't always need to buy a new bed. Depending on why your mattress feels too soft, there are several practical ways to add firmness and support. Here are seven fixes that genuinely work — starting with the cheapest and easiest — plus how to tell when it's actually time to replace the mattress instead.
Before you start, it helps to know what you're dealing with. A brand-new mattress that feels too plush may just need time to settle into a routine with your body. An older mattress that has developed a sagging dip in the middle is a different problem — that's wear, and no topper will fully fix it. And sometimes the mattress is fine, but the base underneath it has gone soft or broken down. The fixes below address each of these situations.
This is the most overlooked fix. A mattress is only as firm as what's beneath it. An old, springy box spring or a bed frame with widely spaced slats lets the mattress flex and sag. Swapping in a solid platform base or a sturdy foundation can transform how firm the whole bed feels. Browse our mattress foundations to find a supportive base — for slatted frames, look for slats no more than about 3 inches apart.
If you like your current frame but the mattress still flexes too much, a bunkie board or a sheet of plywood laid between the mattress and the base adds a flat, rigid surface. It instantly reduces sinkage and is one of the most affordable firmness upgrades you can make. Make sure any plywood is sanded smooth so it doesn't snag the mattress cover.
A quick, no-cost test: place the mattress directly on the floor for a few nights. The hard, completely flat surface removes all the give from your base and makes the mattress feel noticeably firmer. It's a great way to confirm whether your foundation is the real culprit before you spend anything — just keep airflow in mind so moisture doesn't build up underneath.
It sounds backwards, but the right topper can firm up a soft bed. A dense, firm latex or high-density foam topper sits on top of the plush comfort layers and gives you a more supportive surface to rest on. This works especially well when the mattress itself is structurally sound but just too soft on top. For specific recommendations, see our guide to the best mattress toppers to make your bed firmer.
If you sleep on memory foam, temperature matters more than you'd think. Memory foam softens in heat and firms up when it's cooler. Here in Los Angeles, where bedrooms can stay warm well into the evening, a hot room can make a foam mattress feel mushier than it really is. Running the AC a little cooler, improving airflow, or switching to breathable bedding can restore some of that firmness for free.
Body impressions build up where you sleep night after night. Rotating the mattress 180 degrees — or flipping it, if it's a double-sided model — moves you onto a less-worn area and can bring back firmness you thought was gone. Make this a habit every few months to even out wear and extend the life of the bed.
If your mattress is brand new and feels different than it did in the showroom, give it a few weeks. New foams and your own body both need a short adjustment period before the bed settles into its true feel. If after a month it's still too soft and none of the fixes above help, the mattress may simply be the wrong firmness for you.
These tricks add support, but they can't rescue a mattress that's genuinely worn out. If you can see a visible dip, feel the springs, or wake up sore no matter what you try, the most reliable fix is a new bed in the right firmness. If you consistently want more support, it's worth looking at a genuinely firm mattress rather than fighting a soft one — and if you're unsure how firm you actually need, our guide on choosing between a firm and soft mattress can help you decide.
The best way to know is to feel the difference in person. Stop by any of our five Los Angeles showrooms, lie down in your normal sleeping position, and our team can point you toward the right support level — with same-day delivery available so you can sleep better tonight.
It can. A worn-out or springy base lets a mattress flex and feel softer than it should. Replacing it with a solid platform or a sturdy foundation — or adding a bunkie board over a slatted frame — gives the mattress firmer, more even support underneath, which makes the whole bed feel firmer.
Yes. While many toppers are designed to add softness, a firm, high-density foam or latex topper placed over plush comfort layers creates a more supportive surface. It works best when the mattress is still in good shape but feels too soft on top — it won't fix a sagging or broken-down mattress.
Memory foam reacts to temperature, so keeping your bedroom cooler helps it stay firmer, since the foam softens in heat. Beyond that, the same fixes apply: a solid foundation, a bunkie board, or a firm topper all add support. Rotating the mattress regularly also helps prevent soft body impressions.
If the mattress is structurally sound but just too plush, the fixes in this guide — a firmer base, a board, a firm topper, or a cooler room — can make a real difference. But if it's sagging, lumpy, or several years past its prime, those are signs the support layers have worn out, and replacing it with the right firmness is the better long-term solution.
Start with the easy, free fixes — check your foundation, try the floor test, rotate the bed — then add a firm topper or board if you need more. And if your mattress is simply worn out, don't keep fighting it. Take our quick sleep quiz for a personalized recommendation, browse our firm mattresses, or come feel the difference at one of our five LA showrooms.
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