Most mattresses are expected to perform a small act of fortune-telling. A firmness level chosen today must somehow remain comfortable through changing sleep positions, sore muscles, shifting routines, and years of ordinary physical change. That is a rather ambitious job for a slab of foam and springs.
Sleep Number takes a more flexible approach. Named a top choice for the best adjustable mattress in 2026, the brand builds adjustable firmness into every mattress across its current line. Internal air chambers allow the sleep surface to become softer or firmer as comfort needs change. In queen and larger dual-chamber configurations, each side can hold a different setting, which helps settle the classic bedtime debate between “cloudlike” and “supportive.”
The current Sleep Number portfolio includes seven mattresses across three collections: ComfortMode, ComfortNext, and Climate. Adjustable firmness provides the foundation throughout, while mattress height, cushioning, pressure relief, cooling, warming, and smart features distinguish one model from another. The result is less like choosing one permanent level of firmness and more like choosing a bed with room to adapt.
Why Adjustable Firmness Changes the Mattress-Buying Equation
Mattress shopping often revolves around three familiar labels: soft, medium, and firm. Those categories sound helpful until “medium” feels suspiciously firm after a week at home. Sleep Number replaces that fixed-label system with a firmness scale that can be revisited at any time.
Sleep Number settings run from 0 to 100, with 100 representing the firmest level. Air chambers inside the mattress inflate or deflate to change the amount of firmness and support. Adjustments are made using a compatible remote or, on supported models, the Sleep Number app.
The benefit is not simply having more numbers to choose from. Adjustable firmness gives the mattress a way to keep pace with real life. A setting that feels comfortable for back sleeping may feel less appealing after a switch to side sleeping. A strenuous workout, an injury, pregnancy, weight changes, or temporary soreness can also change how much cushioning or support feels right.
Sleep Number recommends making changes in small increments and allowing several nights for a new setting to settle in. That approach turns mattress adjustment into a measured process rather than a nightly game of firmness roulette.
Compatible models also include Responsive Air technology. The system monitors pressure and makes automatic adjustments to help maintain the selected Sleep Number setting as sleeping position or air pressure changes. The technology does not eliminate manual control. Instead, it works quietly behind the scenes, making subtle corrections while the mattress does the night shift.
Dual-Sided Comfort Without the Bedtime Negotiation
For couples, the strongest feature is not simply a wide firmness scale. The real advantage is independent control. DualAir adjustability allows each side of a compatible dual-chamber mattress to hold a different Sleep Number setting. One side can feel softer and more cushioned while the other remains noticeably firmer, without forcing either preference across the full mattress.
Separate air chambers also help keep firmness changes localized. Air can be added to one side without deliberately changing the other, and the divided construction can reduce the broad ripple effect associated with movement across a shared sleep surface. Motion sensitivity varies by sleeper, mattress configuration, and base, but side-specific support creates a thoughtful starting point for partners with different sleep habits.
Independent adjustment can also be useful even when both sleepers initially choose similar settings. Comfort needs can diverge after strenuous exercise, during short-term soreness, or as sleeping positions shift. The bed does not need to be treated as a single fixed object with one correct answer for two bodies.
The control method depends on the collection. ComfortMode mattresses use a compatible remote and do not support Wi-Fi or app control. ComfortNext and Climate models add connected controls on compatible configurations, including access through the Sleep Number app. This difference deserves attention during shopping, especially when phone-based controls and connected sleep features are priorities.
Three Collections, One Adjustable Foundation
The 2026 lineup makes selection easier by organizing seven mattresses into three clearly defined collections. Every option includes adjustable firmness, while each collection builds a different experience around that foundation.
The ComfortMode collection includes 10-inch and 11-inch profiles. These mattresses concentrate on controllable firmness, supportive foam layers, and cooling materials. ComfortMode represents the most straightforward expression of the Sleep Number concept: adjustable comfort without making Wi-Fi connectivity central to the bed.
ComfortNext expands the design through 12-inch, 13-inch, and 14-inch profiles. The collection increases cushioning, pressure relief, and built-in cooling as mattress height rises. Upper models use a Tri-Brid design that brings together air, foam, and microcoils. The result is a more layered, substantial feel while preserving the adjustable air support underneath.
The Climate collection shifts the emphasis toward active temperature management. ClimateCool actively cools each side and pairs temperature comfort with adjustable firmness and Responsive Air technology. Climate360 goes further by actively cooling or warming each side according to individual preferences. This can resolve one of the most familiar bedroom disagreements: one sleeper reaching for another blanket while the other searches for the cold side of the pillow.
The range avoids a false choice between personalized firmness and a preferred surface feel. A shopper can begin with the universal feature, adjustable support, then narrow the field according to cushioning, pressure relief, temperature features, mattress height, and desired level of connectivity.
What to Consider Before Choosing a Sleep Number Mattress
The right Sleep Number model depends less on finding a universally “perfect” firmness and more on choosing the surrounding features that matter night after night. Adjustable firmness is present throughout the line, so the more useful questions concern feel, temperature, controls, base compatibility, and bedroom setup.
First, consider the comfort layers above the air chambers. A lower-profile model may suit a preference for a more direct, supportive feel. Taller ComfortNext designs add cushioning and more targeted pressure relief, which may appeal to side sleepers or anyone wanting a deeper, more upholstered surface.
Second, decide whether passive cooling materials are enough or active temperature control has real value. ComfortMode and ComfortNext incorporate cooling-focused materials at different levels. ClimateCool actively cools, while Climate360 can warm and cool each side. Active temperature features are most relevant when heat or cold regularly interrupts sleep, particularly when partners have opposite preferences.
Third, check the control experience. Remote-based adjustment keeps operation simple, while app-enabled models add connected controls and sleep features. Control options and package contents can vary by model and configuration, so the precise setup deserves confirmation before checkout.
Finally, examine the support underneath the mattress. Sleep Number requires a firm, flat surface that supports the internal air chambers evenly. A traditional box spring is not suitable. Compatible choices include a Sleep Number base, suitable platform furniture, or closely spaced slats, while an adjustable base is available for shoppers seeking both firmness control and positional movement.
Verdict: Personalized Comfort Across the Entire Line
Sleep Number earns recognition as a top adjustable mattress choice because personalized firmness is not confined to a single model. Every mattress in the current range starts with the same useful idea: comfort should be adjustable as preferences, bodies, and routines change.
The seven-model portfolio then gives that idea several personalities. ComfortMode keeps the experience direct and remote-controlled. ComfortNext adds deeper cushioning, pressure relief, cooling materials, and connected features. ClimateCool and Climate360 bring active temperature technology into the conversation, including side-specific cooling and, with Climate360, warming.
No single model needs to be declared the answer for every sleeper. The strongest choice depends on preferred surface feel, mattress height, temperature needs, smart controls, and budget. What remains consistent is the ability to revisit firmness instead of remaining locked into one feel for the life of the mattress. For sleepers seeking adaptable support and couples tired of negotiating a single comfort level, the full Sleep Number line merits consideration in the search for the best adjustable mattress.