1. Trial length, and when it starts
A home trial lets you return a mattress after sleeping on it. Check the length, and check when it starts: usually on delivery, sometimes on order. A long trial is only useful if the return conditions are reasonable.
Across our catalog, 35 of 37 mattresses have a published trial length on file, ranging from 90 to 365 nights (the lengths we see are 90, 100, 120, 365 nights). The rest show “Not yet verified” until we confirm them.
2. The minimum adjustment period
Many trials include a break-in or adjustment period, a minimum number of nights before you can start a return. Some brands in our catalog state one explicitly; others say there is none. It exists because the first nights on any new mattress are a poor guide to how it will feel after your body adjusts.
Plan to use the whole adjustment period, and put a reminder in your calendar for the last day of the trial.
3. What a return costs
“Free returns” does not always mean free. Look for pickup or processing fees, extra charges for some regions, non-refundable charges for things like expedited shipping or old-mattress removal, and whether the refund is full or partial. Check too whether there is a limit on how many returns you can make, and how the mattress leaves your home: collected, donated, or something you must arrange.
4. Warranty length and type
Warranties cover manufacturing defects, not comfort. A non-prorated period means the manufacturer repairs or replaces at no cost; a prorated period means you pay a growing share as the mattress ages. Many long warranties combine the two.
In our catalog, 21 mattresses have a warranty length in years on file and 15 are sold with a “lifetime” warranty. Lifetime warranties in particular are worth reading closely, because the terms often change after the first years.
5. What counts as a sag
This is the line that matters most. Warranties define a sag or impression as a defect only beyond a stated depth, measured in a specific way, often with no weight on the mattress. A dip you can feel may be shallower than the threshold and not covered. Heavier sleepers in particular should compare these thresholds; see our guide to back support for heavier sleepers.
6. Conditions that can void cover
Read the small print on the base and care. Warranties commonly require a supportive foundation of a stated type and often exclude stains or physical damage. Read your brand’s list of exclusions before the mattress arrives; a mattress protector is a cheap way to avoid a stain becoming a problem.
7. Size and height
Check the dimensions of the exact size you are buying and the mattress height. A tall mattress on a tall frame can make getting in and out awkward, and deep mattresses need fitted sheets with deep pockets. Our catalog shows the height where the brand publishes it, and “Not yet verified” where we have not confirmed it.
8. What the price includes
Compare like with like: the same size, and the same extras. Check whether delivery, setup, old-mattress removal and a foundation are included or extra. Prices change often; our catalog records the queen price with the date it was checked, and shows “Not yet verified” rather than guessing.
Once you have a shortlist, put up to three side by side on Compare.
