Best Mattress Firmness for Side Sleepers
The best mattress firmness for side sleepers is a soft to medium comfort layer — roughly a self-reported 3 to 6 out of 10 — because it lets the shoulder and hip compress enough to keep the spine roughly level instead of being pushed out of line by a too-firm surface. Body weight shifts the answer: heavier side sleepers (over ~230 lb) compress further and may need a thicker comfort layer or a firmer pick to avoid bottoming out onto the support core.
We don't publish prices or star ratings. Firmness numbers below are each brand's own self-reported label — there is no industry-standard scale — so we name construction and disclosed ILD wherever a brand provides it.
Side sleeping concentrates body weight on two narrow, bony points — the shoulder and the hip. A comfort layer that is too firm resists compressing there and can tilt the spine out of a neutral line; a softer layer lets those points sink while the support core holds the rest of the body up. The catch when shopping: every brand's firmness number is self-assigned, so the picks below are organized by what each brand actually discloses.
The one thing to know: Side sleepers generally benefit from a softer comfort layer (roughly self-reported 'soft' to 'medium') that lets the shoulder and hip sink in enough to keep the spine level. Back sleepers usually do best in the 'medium' to 'medium-firm' range, balancing some cushioning with enough support to prevent the hips from sinking too far. Stomach sleepers typically want 'medium-firm' to 'firm' so the midsection doesn't sink and pull the lower back out of alignment. These are general equipment-fit guidelines, not medical advice — consult a clinician for any back-pain concern.
Soft-band picks for side sleepers
These are the soft-band picks from our dataset. Each card links to a live tagged Amazon search — never a fixed listing — and every pick names an honest drawback.
Saatva Classic Plush Soft
Innerspring hybrid, self-reported 'Soft' (~4/10 house scale), euro pillow-top comfort layer, dual coil support core
One of the few soft-tier mattresses that still uses a full coil support core, so it stays soft on top without losing edge support or airflow.
Best for: Lighter-weight side sleepers who want pressure relief at the shoulder/hip without an all-foam feel
Watch out: Saatva's own firmness numbers are a HOUSE scale, not an industry standard — its 'Soft (4)' will not feel identical to another brand's '4'. ILD for the pillow-top layer is not publicly disclosed.
Check price on AmazonBrooklyn Bedding 3" Latex Topper — Soft
Natural Talalay latex topper, manufacturer-published comfort ILD 19 (soft tier of a 19/28/36 lineup), 3 in thickness
A rare case where the brand actually publishes the ILD number on the spec sheet, so you can compare it directly to their own medium (28 ILD) and firm (36 ILD) versions.
Best for: Side sleepers wanting to soften an existing firm mattress rather than replace the whole bed
Watch out: A topper only changes the top few inches — it doesn't change the support core underneath, so a very firm base can still feel firm through a soft topper for heavier sleepers. Note this specific topper is not currently listed on Amazon (the brand sells mattresses there, but we could not find this topper), so buying it means going direct; the link below shows comparable soft Talalay latex toppers available on Amazon.
Check price on AmazonNectar Original Mattress
All memory-foam construction, self-reported 'Medium Firm' by brand (~6/10) but third-party reviewers commonly score it softer (~5-6) at the shoulder/hip; ILD not disclosed
Deep, slow-recovery memory-foam contouring at a lower price point than most latex or hybrid soft-tier beds.
Best for: Budget-conscious side sleepers who want a classic slow-sink memory-foam feel
Watch out: Memory foam sleeps warmer than latex or coils and has a slower response — turning over can feel like fighting the mattress. No ILD figures are published for any layer.
Check price on AmazonHow body weight changes the pick
Body weight changes how firm a given ILD or firmness label actually feels, because a heavier body compresses further into any given foam before reaching equilibrium. A lighter sleeper (under ~130 lb) sits nearer the top of a comfort layer and feels its true surface firmness; a heavier sleeper (over ~230 lb) compresses through the comfort layer into the firmer support core beneath, so the same mattress can feel noticeably softer to them than the label suggests. This is why firmness guides that ignore body weight are incomplete.
Construction changes the feel at the same label
Identical ILD numbers feel different depending on construction. Memory foam has a slow, viscoelastic recovery that deepens the sink-in feeling at a given ILD; latex responds quickly and feels more buoyant at a comparable ILD; a hybrid's coil support core adds bounce and can make a soft comfort layer feel more supportive than the same foam over an all-foam base. So ILD is only directly comparable within similar constructions — a 28-ILD latex layer and a 28-ILD memory-foam layer will not feel the same.
Frequently Asked Questions
A soft to medium comfort layer — roughly a self-reported 3 to 6 on a brand's own 1-10 scale — is generally best for side sleepers, because it lets the shoulder and hip compress enough to keep the spine roughly level. Remember that firmness numbers are self-assigned per brand, not standardized, so compare construction and disclosed ILD where available rather than the number alone.
If your current mattress's support core is fine and only the surface is too firm, a soft topper — such as a soft-tier Talalay latex topper with a published comfort ILD of 19 — changes the top few inches without replacing the bed. But a topper doesn't change the support core underneath, so a very firm base can still feel firm through it for heavier sleepers.
Often, yes. A heavier body compresses further into any given comfort layer, so a heavier side sleeper may bottom out on a thin soft layer and do better with a thicker comfort layer or a slightly firmer option, while a lighter sleeper feels the surface's true firmness. Rough informal bands: under ~130 lb lighter, ~130-230 lb average, over ~230 lb heavier.
No. This is equipment-fit guidance about support and pressure distribution only. A mattress does not treat, prevent, or relieve any medical condition — for a specific pain concern, consult a physician or physical therapist.