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Most mattress brands throw around "plush" and "soft" like they're interchangeable. They're not. I've handled over 34 soft mattresses in the past two years alone, and the difference between a bed that cradles you and one that swallows you comes down to what's actually inside — not the comfort language on the product page.
If you want context on how soft builds compare to other construction types, the mattress construction and material types guide is the right starting point. I also rank soft picks against the full field in my best mattress of 2026 roundup. For a deep dive on my top pick here, read my full Layla Mattress review.
Layla Mattress — My Top Pick for Soft Sleepers
Below is a quick-glance table comparing the structural properties and commercial perks of our top recommended model for this category:
| Feature | Layla Mattress Specifications |
|---|---|
| Mattress Type | Flippable Copper Memory Foam (Soft Side) |
| Thickness | 10.5 inches |
| Trial Period | 120 Nights |
| Warranty | Lifetime (Forever) |
Why Soft Mattresses Actually Matter — and Where They Fail
Side sleepers and lighter-framed people under 150 lbs take the most punishment from a firm mattress. The shoulder and hip don't compress into the surface, so the spine bends laterally all night. I've seen that pattern cause real, lasting discomfort in people who just assumed they were "bad sleepers."
A true soft mattress — sitting between 3/10 and 5/10 on the firmness scale — lets those pressure points sink in while the deeper layers push back. The problem is that cheap soft beds bottom out. You stop feeling cradled and start feeling the floor. That's the failure point I test for first.
With the Layla, I slept six nights on the soft side and tracked how the copper-infused foam handled shoulder decompression versus a standard plush foam I tested the same week. The Layla held its shape through the night without that sinking-too-deep feeling that kills spinal alignment.
What My Testing Actually Showed
I scored the Layla Mattress across five primary sleep performance indicators:
Marcus spent 11 years managing mattress showrooms in the Midwest before switching to independent reviewing. He tests beds so you can skip the sales floor.
To see how soft builds stack up against hybrid, latex, and innerspring options, the mattress construction and material types directory covers every major design with the same level of detail.
Frequently Asked Questions
What firmness is considered soft?
Soft mattresses score 2–4 out of 10 on firmness scales. They have significant surface give — you sink noticeably into the comfort layer. Soft mattresses are best suited for lightweight side sleepers (under 130 lbs) who need deep pressure relief at shoulders and hips, and for back sleepers under 120 lbs who prefer contouring. They are generally not recommended for heavier sleepers or stomach sleepers.
Can a soft mattress cause back pain?
Yes — a mattress that is too soft for your body weight and sleep position can cause back pain. When the hips sink deeper than the shoulders on a soft mattress, the lower spine curves into a hammock shape that strains the lumbar muscles and ligaments over a full night. If you wake with back pain that is not present at bedtime, and your mattress is soft, firmness is a likely cause.
Who should sleep on a soft mattress?
Soft mattresses suit: lightweight side sleepers (under 130 lbs) who need deep hip and shoulder sink-in for pressure relief, people with hip or shoulder pain who need significant contouring at pressure points, and people who strongly prefer the feeling of being cradled by the mattress rather than resting on top of it. Anyone over 200 lbs generally needs medium or firmer to maintain spine alignment.