Frequently Asked Questions

For most people with back pain, medium-firm is the sweet spot. A well-known randomized trial in The Lancet found people on medium-firm mattresses had less low-back pain and disability than those on firm mattresses. Too soft lets the hips sink and the spine sag; too firm creates pressure points at the shoulder and hip. Your body weight and sleep position shift the target a little.

No. CertiPUR-US certifies the polyurethane foam only — it tests that foam for restricted chemicals, low emissions and certain flame retardants. It says nothing about the cover, the fire barrier, or the whole assembled mattress, and it does not address fiberglass. A bed can have CertiPUR-US foam and still use a fiberglass fire sock. See our Certification Decoder for the full scope of each label.

The only honest way to know is to check the maker's own statement. On Pillow & Post we mark a mattress fiberglass-free only when its listing explicitly states it — for example the Zinus and LUCID beds we feature. Where a listing doesn't state its fiberglass position, we print 'Not published' rather than assume. Our fiberglass-free roundup lists the beds that actually make the claim.

Fiberglass is a cheap, effective fire barrier used under the cover of many budget mattresses. It's safe while the cover stays on, but if you unzip and remove the cover — which some care labels wrongly imply you can — the fibers can escape and are difficult to clean up. That's why buyers who care about it look for a stated fiberglass-free build or an organic-standard (GOTS/GOLS) bed, which prohibits it.

It depends on your body and position. Memory foam contours and relieves pressure, which suits lighter and side sleepers; a hybrid's coils add support, airflow and edge strength, which suits heavier bodies, back sleepers and couples. Our memory-foam-vs-hybrid guide walks through which is right for you.

Sometimes. A topper can firm up a too-soft bed or cushion a too-firm one, and it's far cheaper than a new mattress. What it can't do is rescue a sagging, worn-out bed — a topper adds a comfort layer, not structural support. If your mattress is more than about eight years old and dipping, a topper is a patch, not a fix.

One that keeps your neck in line with your spine. Side sleepers usually need a higher, contoured pillow to fill the gap above the shoulder; back sleepers need a lower loft. An adjustable pillow (like a shredded-foam one you can add or remove fill from) is the safest bet if you're unsure or change position through the night.

For some people, yes. Raising the head and knees into a 'zero-gravity' position takes load off the lower back and can ease conditions like sciatica or acid reflux that disrupt sleep. An adjustable base pairs with most foam and hybrid mattresses. It's a comfort aid, not a cure.

No, and we say so plainly. We don't own the products and we run no test lab. Instead we compile each product's published specs, record the certifications the maker states and explain their scope, and cite the evidence behind our firmness and material advice. Our methodology page lays out exactly what we do — and it's checkable.

Through affiliate links: if you buy through one of our buy buttons, we earn a small commission at no extra cost to you. As an Amazon Associate we earn from qualifying purchases. It never changes which product we recommend — see our affiliate disclosure and editorial policy.

We're an independent publisher, not a store. We point you to where you can buy each product (currently Amazon), which keeps us free to recommend the best option for you rather than the one we happen to stock. It also means we can't help with orders, returns or warranties — those go to the retailer.

They're pulled from a live Amazon feed daily and stamped with the date. If the feed stops, the number disappears and the button falls back to 'Check price on Amazon' rather than showing a stale figure. The price at checkout is always the one that counts.

Because they're largely not sold on Amazon, and we only build a buy button we can actually stand behind. Those brands sell direct, and we haven't joined their programs, so we don't link them today. Instead we focus on the certified, back-supportive beds Amazon genuinely carries — Zinus, LUCID, Amazon Basics, DreamCloud and others.

We note the sleeper types each product suits on its page. As a rule of thumb, all-foam beds suit lighter and average bodies and side sleepers; hybrids with coils are the better call for heavier bodies (roughly 230 lb and up) and couples, because the coils resist sinking and hold the edge.

Most mattresses are good for around 7–10 years, less for cheaper all-foam beds. Signs it's time: visible sagging or body impressions, waking up stiffer than you went to bed, or a mattress that's clearly softened. A topper can buy you a little time but won't reverse structural sag.