Finding the best mattress for back pain can be difficult because comfort is highly personal. A mattress that feels supportive to one person may feel too firm or too soft to another. Sleep position matters too, especially when pressure builds around the lower back, hips, shoulders, or knees.
Sleep Number’s ComfortNext Ultra takes a more flexible approach. Instead of locking sleepers into one firmness level, the 14-inch mattress can be adjusted from softer to firmer whenever comfort needs change. Queen sizes and larger also allow each person to choose a separate firmness level on each side of the bed.
The mattress pairs that flexibility with plush foam, small supportive coils, cooling materials, and smart technology that can respond as a sleeper moves during the night. The goal is simple: provide cushioning where the body needs relief while giving sleepers more control over how supportive the bed feels.
Adjustable Firmness Makes It Easier to Find the Right Support
One of the biggest challenges when shopping for a mattress is choosing the right firmness before spending much time sleeping on it. ComfortNext Ultra reduces that pressure by letting sleepers change the feel of the mattress after bringing it home.
Firmness can be adjusted through the Sleep Number app. A sleeper who feels like the hips are sinking too deeply can try a firmer setting. Someone feeling too much pressure around the shoulders, hips, or lower back can test a softer setting.
That flexibility can be especially useful because comfort needs do not always stay the same. Sleep position can change from night to night. The body may also feel different after exercise, travel, a long workday, or changes in weight.
Couples get another practical benefit. On queen mattresses and larger, each person can adjust their side of the bed to be firmer or softer, so both sleepers can find what feels best to them. Smaller sizes use one adjustable firmness setting for the mattress.
ComfortNext Ultra also includes Responsive Air technology. When turned on, the bed can make small firmness adjustments as a sleeper changes position. Instead of requiring someone to wake up and change the setting manually, the mattress works to keep the selected comfort level feeling consistent throughout the night.
ComfortNext Ultra Combines Cushioning and Support
ComfortNext Ultra uses what Sleep Number calls a Tri-Brid design. In simpler terms, the mattress combines three types of support: plush foam on top, small coils through the middle, and adjustable air support underneath.
Each layer has a different job:
- Plush high-density foam cushions the body and helps reduce pressure around common sore spots.
- A 2.4-inch layer of individually wrapped microcoils provides extra support around the hips and lower back.
- Adjustable air support lets sleepers make the mattress softer or firmer without changing mattresses.
Sleep Number describes ComfortNext Ultra as offering maximum relief within the ComfortNext collection for the hips, shoulders, knees, and lower back.
The microcoils are particularly useful in the middle of the mattress, where much of the body’s weight tends to rest. The coils add another layer of support beneath the foam while still allowing the surface to feel cushioned.
That balance matters for shoppers concerned about back comfort. A mattress that feels too soft can allow the body to sink farther than desired, while an overly firm mattress may create uncomfortable pressure points. ComfortNext Ultra gives sleepers room to experiment with the firmness level while the foam and coils continue providing cushioning and support.
Cooling Materials Help Keep the Plush Surface Comfortable
Thicker mattresses can sometimes feel warm because the body settles deeper into the comfort layers. ComfortNext Ultra addresses heat through built-in cooling materials and a design intended to allow more air to move through the mattress.
Sleep Number states that ComfortNext Ultra contains 175% more built-in cooling materials compared with the reference level used for the ComfortNext collection. The Ultra is also designed to provide maximum airflow within the lineup.
The important distinction is that ComfortNext Ultra does not actively cool the mattress using powered temperature-control technology. Instead, the mattress uses cooling materials and airflow to help manage heat while maintaining a plush feel.
For shoppers who like deeper cushioning but tend to notice heat at night, that combination may be worth considering.
Smart Features Make Comfort Easier to Adjust Over Time
ComfortNext Ultra connects with the Sleep Number app, which serves as the main control for firmness and other smart-bed features.
The mattress also includes SleepIQ technology. Sensors inside the bed automatically track sleep without requiring a watch, ring, or other wearable device. The app provides a SleepIQ score each morning along with information that can help sleepers understand sleep patterns over time.
SleepIQ can track details such as sleep duration, restful and restless periods, bed exits, average heart rate, and average breathing rate. As more nights are recorded, the app can provide personalized insights based on sleep habits.
The practical benefit is that mattress adjustments do not have to be based on a single night’s experience. Sleepers can try different firmness levels, pay attention to how the body feels in the morning, and review sleep information over several nights.
SleepIQ is designed as a sleep and wellness tool. It is not intended to diagnose, treat, cure, or prevent medical conditions.
Sleep Number also backs ComfortNext Ultra with several ownership features. The mattress comes with a 100-night trial, giving sleepers time to try different settings at home. Current purchases also include a 10-year limited warranty, with two years of full coverage followed by eight years of limited coverage.
ComfortNext Ultra is HSA/FSA eligible for qualified customers, subject to applicable plan requirements and any necessary documentation. The mattress is available through Sleep Number stores and sleepnumber.com.
Is Sleep Number ComfortNext Ultra a Good Choice for Back Pain?
No mattress can guarantee relief from back pain, and ongoing or severe pain may require evaluation by a medical professional. What ComfortNext Ultra offers is greater control over one of the most important mattress variables: firmness.
Instead of choosing one comfort level and hoping it works long term, sleepers can make the bed softer or firmer as needs change. Plush foam helps cushion pressure points, microcoils provide extra support around the hips and lower back, and Responsive Air can help maintain the preferred setting as a sleeper moves.
For shoppers researching the best mattress for back pain in 2026, ComfortNext Ultra stands out most for that flexibility. The mattress does not assume that everyone needs the same type of support. It gives each sleeper more freedom to find a firmness level that feels comfortable and adjust it over time.
