How we test products
Our mission is to take the guesswork out of finding the perfect sleep products.
We've dedicated hundreds of hours to testing mattresses and sleep accessories, and rely on a team of testers of differing weights, temperature preferences, and sleeping positions to evaluate each product.
Tested products are granted the Sleep Hero tested stamp of approval, a mark of our review's reliability.
If we haven't personally tested a product, please be assured that we invest significant time and energy into scouring the UK market and researching the best recommendations, and we work with a team of sleep experts who review our articles, ensuring that the insights we provide are not only relatable but also reliable.
How thick should a mattress topper be?
Mattress toppers are available in a range of thicknesses. 🙌
Most mattress toppers start around 4 cm - 5 cm (1.57 - 1.9") deep.
An extra thick mattress topper can measure 7 - 10 cm (3 - 4"), almost double the thickness of a regular topper.
What is the thickest mattress topper?
The thickest mattress topper is around 10 cm (4") in depth.
A 10 cm (4") thick mattress topper can provide even more comfort than a standard mattress topper.
The additional depth moulds around your hips and shoulders and relieves pressure from these areas.
An extra thick mattress topper can even make a firm mattress feel softer. 😍
The Acrali Home mattress topper, made with soft microfibre, is one of the thickest toppers available.
Take a look below:
Do you need a thick mattress topper?
So, what type of person requires a thick mattress topper?
Many people could benefit from a thick mattress topper, but it depends on your weight, sleeping position and firmness preference.
Thick mattress toppers are best for side sleepers
Deep mattress toppers are a perfect choice for side sleepers. ✔️
This is because side sleepers need a mattress that moulds around the hips and shoulders when sleeping in the side position.
The best extra thick mattress topper will contour to the body's shape and relieve pressure in the joints.
A thick memory foam mattress topper gently contours around the body's shape and provides a weightless feeling.
Thick mattress toppers are ideal for lighter people
Lighter-weight people may benefit from a thick mattress topper. 👌
Often, even medium-feel mattresses can feel too firm for lighter people. 🧱
A mattress that is too firm can put pressure on the hips and shoulders and have you waking up with aches and paints.
A deep mattress topper cushions those areas whilst encouraging better spinal support for those who weigh less.
Thick mattress toppers can help those with joint pain
Some people suffer from aches and pains in the hips, pelvic region, elbows, and shoulders.
A mattress that is too firm puts pressure on the joints and spine, which can have you tossing and turning throughout the night. 🙁
However, a thick mattress topper will cushion around these sensitive pressure points.
Those who are elderly, pregnant or suffer from chronic pain could benefit from an extra-thick mattress topper.
Alternatively, those struggling to sleep during pregnancy should consider a body pillow for extra support.
When is it time to buy a new mattress?
It’s important to remember no matter how thick the mattress topper is, there is only so much that it can do.
An extra thick mattress topper can help relieve pressure and provide additional comfort.
However, if your mattress is old and dipping, it might be time to throw in the towel. 🙅
A mattress topper isn’t going to be a cure for indents or mattresses that provide no support.
Instead, consider replacing the mattress altogether.
Buying a mattress doesn’t have to be stressful, and most now come with sleep trials and extended warranties to keep you protected. 🤞
Our best mattress guide has the top UK mattress recommendations.
Thick mattress topper sizes
A deep mattress topper comes in standard UK sizes.
- Thick mattress topper single: 90 x 190 cm (3’ x 6’3”)
- Thick mattress topper small double: 120 x 190 cm (4' x 6'3")
- Thick double mattress topper: 135 x 190 cm (4’6” x 6’3”)
- King size mattress topper thick: 150 x 200 cm (5’ x 6’6”)
- Thick mattress topper super king size: 180 x 200 cm (6’ x 6’6”)
You should choose a mattress topper to match the size of your current mattress.
For example, you should purchase a thick mattress topper king-size option if you have a king-size mattress.
On the other hand, those with a double mattress should opt for an extra thick mattress topper double size.
Thick mattress topper depths
Mattress toppers also come in a range of depths. ✅
Extra deep mattress toppers are usually 7 - 10 cm (2.7 - 3.9 inches) deep.
Should you buy a thick mattress topper?
Whether or not you need a thick mattress topper depends on your needs and lifestyle.
A thick mattress topper is an excellent choice for side sleepers, those with joint pain, or lighter weight sleepers who will experience a good night’s sleep on a thick topper.
But they’re not for everyone.🤔
For many, a regular mattress topper or a brand new mattress might be more appropriate.