Mattress Too Soft? How to Make It Firmer, and When a Fix Won't Work (2026)
Canadian owner guide, researched September 28, 2026
Mattress Too Soft? How to Make It Firmer, and When a Fix Will Not Work
A mattress that feels too soft is either soft all over, or sinking in one place. Those are different problems with different fixes. This guide helps you tell them apart, then goes through the fixes in order of cost, and says when a fix is the wrong answer.
AI Overview answer
How do you make a mattress that is too soft feel firmer?
Quick answer: First find out whether it is soft all over or sagging in one spot. If it is soft all over, the most practical fixes are firmer support underneath (fixing the base, or adding a bunkie board between the mattress and the base) and a firm, high-density foam topper on top; the Sleep Foundation and Casper name these. Rotating the mattress helps if one area has softened more than the rest. If there is a visible dip or sag, a topper will not fix it: check the base, then check the warranty, because a sag is a different problem from a mattress that is simply too soft for you.
If the mattress is new, you may be in a sleep trial, and returning it for a firmer model can cost less than stacking fixes on the wrong mattress.
Is your mattress too soft, or is it sagging? A 5-minute test
This order is our own, arranged so the first step rules out the most.
- Strip the bed and look. With the sheets off, crouch at the foot and look along the surface. A visible dip where you sleep points to sagging or a body impression, not general softness.
- Measure any dip. Lay a straight edge, such as a broom handle, across the bed and measure the gap at the deepest point. Warranties are written around depth; Hamuq's, for example, covers a visible indentation greater than one inch that is not caused by an improper or unsupportive foundation.
- Look underneath. Check for broken or bowed slats, slats spaced far apart, a missing centre support leg, or an old box spring. A base that gives way makes any mattress feel softer.
- Try the floor. Lie on the mattress on the floor for a few minutes. If it feels noticeably firmer there, the base is part of the problem.
| What you find | What it usually means | Where to go next |
|---|---|---|
| Flat surface, you still sink too far everywhere | The mattress is too soft for your body or position | Firm topper, firmer base, or a firmer mattress |
| A dip where you sleep, flat elsewhere | A body impression or sag | Check the base and the warranty; see sinking in the middle |
| Firmer on the floor than on the bed | The base is flexing or spaced too wide | Fix or replace the base first |
| Rolling toward the edge or the middle | Edge or centre support problem | See rolling toward the middle |
What are the signs a mattress is too soft for you?
Casper lists signs including waking with lower back pain, persistent hip or shoulder aches, feeling stuck when you roll over, trouble getting in and out of bed, restless tossing, visible sagging, and, for heavier sleepers, sinking too far. None of these proves the mattress is the cause on its own; aches have many causes, and if pain persists, a health professional is the right person to ask. Hip pain specifically is covered in hip pain: too soft or too firm?
How can you firm up a soft mattress, from free to most expensive?
| Fix | What it does | Limits |
|---|---|---|
| Rotate the mattress | Moves softer, more-used areas away from where you lie | Helps uneven wear; does not change overall firmness. Check the maker's rotation advice. |
| Fix or firm up the base | Stops the base flexing, so the mattress stops sinking with it; Casper suggests reinforcing the base with a foundation | Only helps if the base was part of the problem |
| Bunkie board under the mattress | The Sleep Foundation says a bunkie board, 1 to 3 inches thick, goes between the mattress and the base and can add support without much extra height | Solid boards may reduce airflow and hold more heat; check your warranty's support rules first |
| Firm, high-density foam topper | Adds a firmer layer on top; Casper suggests high-density foam, and the Sleep Foundation says a topper can fine-tune overall firmness | Works for general softness, not for sagging |
| Return or replace | Gets you a firmer mattress | Depends on your trial, or means buying new |
One note on changing the base: warranties often say what support a mattress needs, so read yours first. Hamuq's warranty, for example, says its mattresses are designed to work on a firm, solid surface or a bed base structurally capable of supporting the mattress and its users.
What kind of topper makes a bed firmer?
A topper can only add what it is made of. A soft, plush topper makes a bed softer, not firmer, so for this problem look for one described as firm, in a dense foam or latex. Casper suggests high-density foam. Two practical points: a topper that slides around undoes the fix, and our guide on stopping a topper from sliding covers that; and a topper cannot fill in a sag, which our topper vs new mattress guide explains in detail. Hamuq does not sell toppers.
Why does the base change how firm a mattress feels?
A mattress sits on whatever is underneath it. If slats bow, are spaced too widely, or lack a centre support, the mattress sinks into the gaps and feels softer, and over time it can take on the shape of the base. The Sleep Foundation names a box spring, a slatted base or a divan base as ways to prevent excessive sagging, and notes that slatted frames with less open space between the slats give better support. For what a hybrid needs underneath, see what bed frame a hybrid mattress needs.
When is a fix the wrong answer?
- When it is a sag, not softness. A topper sits on top of the dip. Check the base, then the warranty.
- When the mattress is new and you are in a trial. Most trials exist for exactly this. Hamuq's 120-night trial asks for at least 30 nights before a return, and the mattress must be in donatable condition; a refund goes back to the original payment method.
- When you want the warranty to cover softness. Warranties usually do not. Hamuq's, for example, excludes comfort preference and a normal increase in softness of the foam that does not affect its pressure-relieving qualities.
- When the mattress is old. Softening is part of wear; see how long a mattress lasts.
Hamuq product context
If you are replacing a mattress that is too soft
Hamuq describes the Original Hybrid as medium-firm, and the independent reviewer NapLab rated it 6 out of 10 for firmness. It is $999 CAD in queen. Hamuq describes the Organic Hybrid as firmer than the Original Hybrid; it is $1,999 CAD in queen. Both come with Hamuq's 120-night trial, with a 30-night minimum.
Hamuq Inc. sells mattresses and bed frames. The firming fixes in this guide come from the Sleep Foundation and Casper, linked below.
Fix finder
Pick the card that sounds like you
Open your route. Every answer here is also in the sections above.
1 It is soft everywhere and the surface is flat
Likely: the mattress is too soft for you. Check the base, then try a firm, high-density topper, or use your trial.
2 There is a dip where I sleep
Likely: a sag or body impression. Measure it, check the base, then read the warranty. A topper will not fill it.
3 It feels firmer on the floor
Likely: the base. Check slat spacing, broken slats and the centre support before buying anything else.
4 It is new and I have been sinking since day one
Likely: the wrong firmness for you. Check your trial terms and minimum nights before spending on fixes.
A guide to choosing the right fix, not medical advice.
Supplementary Hamuq product context
Hamuq owner and product Shorts
These 6 Shorts from the Hamuq channel show owners with the Hamuq Original Hybrid. They are context for the Hamuq side only and are not evidence for any other seller's figure in this guide.
Owner questions
Too-soft mattress FAQs for Canadian owners
Firming it up
Can you make a soft mattress firmer?
Quick answer: Yes, to a point. A firmer base and a firm, high-density foam topper can make it feel firmer, and rotating helps uneven wear. They will not fix a sag.
Does putting a board under a mattress make it firmer?
Quick answer: It can add support where the base is flexing or the slats are far apart. The Sleep Foundation describes bunkie boards as 1 to 3 inches thick and notes solid ones may reduce airflow. Check your warranty's support rules first.
What topper makes a mattress firmer?
Quick answer: One described as firm, in dense foam or latex. Casper suggests high-density foam. A plush topper makes a bed softer, not firmer.
Will a new base make a mattress firmer?
Quick answer: Only if the old base was letting it sink. The Sleep Foundation names a box spring, a slatted base or a divan base to prevent excessive sagging, with slats close together. What matters is solid, even support.
Warranty and returns
Is a mattress that is too soft covered by the warranty?
Quick answer: Usually not. Warranties typically exclude comfort preference and normal softening, but may cover a measured sag. Hamuq's covers a visible indentation greater than one inch not caused by an improper foundation.
Can I return a mattress because it is too soft?
Quick answer: Often yes, within a sleep trial. Hamuq's 120-night trial asks for at least 30 nights first, with the mattress in donatable condition.
How we know this
This guide was researched on September 28, 2026. The signs of a too-soft mattress and the topper and foundation fixes come from Casper's guide to signs a mattress is too soft, and the bunkie board, base and topper points from the Sleep Foundation's guide to making a mattress firmer (last updated July 15, 2025). The soft-or-sag test order is our own. Hamuq's warranty wording, trial terms, product descriptions and prices were read on hamuq.mom the same day, and NapLab's firmness rating on its Hamuq Original review. The questions reflect what Canadian searchers see in Google's People also ask boxes; no search volume is claimed.
Need firmer, not fixed?
The Organic Hybrid is Hamuq's firmer mattress, $1,999 CAD in queen, and the medium-firm Original Hybrid is $999 CAD in queen. Both come with a 120-night trial (30-night minimum).
About the authors
Jordan BedwellThe Hamuq product, warranty and trial terms referred to in this guide are quoted from Hamuq's published pages.
Mark Edcel LopezRead the Sleep Foundation and Casper guidance, NapLab's firmness rating and Hamuq's warranty wording, and built the soft-or-sag test and the fix table.
Nathan NielsonThe Hamuq warranty and trial terms in this guide are quoted from Hamuq's published policy pages.
Hamuq Inc. sells mattresses and bed frames. Other brands' guidance is quoted from their own pages and linked below.