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Choose it for firm all-foam support, quick response, low price, and Costco's return protection. Back and stomach sleepers under roughly 250 pounds have the clearest fit. Side sleepers—most notably from 130 to 250 pounds—should expect greater shoulder and hip pressure. The measurements below describe the 14-inch Copper Infused Firm, whose construction differs from other Sleep Science models.
Pressure maps showed broadly distributed load for back and stomach positions, while side testing concentrated pressure at the shoulder and hip. The 2.00–2.08-inch sinkage and 3-inch comfort system explain why the surface feels balanced for some positions but shallow for side sleeping.
The mattress combined 2.00–2.08 inches of measured sinkage with 11 inches of support foam under a slightly firm 7/10 surface. Back and stomach testing stayed stable below roughly 250 pounds, while heavier bodies had less transition depth above the firm support core.
Motion transfer measured 12.50–13.02 m/s² peak-to-peak and remained detectable for 0.57–0.59 seconds. The 6.98–7.26-inch bounce limited prolonged oscillation, but larger turns still travel farther than they do on the best motion-isolating foam mattresses.
A fixed 12 lb load creates the impact while an accelerometer records the movement that crosses the mattress.
After heat loading, the surface temperature fell only 2.65–2.75°F in the first minute. Copper-infused memory foam, copper-gel foam, and the Air Grid are present, but the all-foam 14-inch build released heat slowly in testing.
Seated edge compression measured 4.61–4.79 inches despite the wedge support system. The lying edge remained fair and recovered quickly, making it usable for sleep but less stable for repeated sitting or mobility transfers.
We measure seated compression, then check how secure the surface remains while lying directly along the edge.
The surface mostly recovered in 0.196–0.204 seconds and fully recovered in 0.78–0.82 seconds after loading. Its 6.98–7.26-inch bounce stays low, so turns are easy and controlled rather than springy or destabilizing.
The measured 14-inch profile contains 3 inches of comfort foam over 11 inches of support foam, including the lower foam and wedge perimeter. The shallow comfort system concentrates surface wear in a smaller layer, while deep sitting compression adds stress near the edge.
The score uses the policy terms shown in the Fine Print Check below. Models governed by the same terms use the same policy inputs.
Copper-gel cooling foam and Air Grid construction help the mattress stay cool.
The ventilation features are present, but our temperature curve showed slow heat release.
Hot sleepers should prioritize the measured cooling result over the material name.
The wedge system adds sleeping surface near the edge.
Lying support was fair, while seated edge compression reached 4.70 inches.
The edge is usable for lying but less stable for sitting and transfers.
Costco identifies item 1232954 as the 14-inch Firm memory-foam model with copper-infused memory foam, copper-gel cooling foam, Air Grid base, wedge support, and included delivery. Costco's current merchandise policy provides broad satisfaction-based return protection.
Costco identifies item 1232954 as the 14-inch Firm memory-foam model with copper-infused memory foam, copper-gel cooling foam, Air Grid base, wedge support, and included delivery. Costco's current merchandise policy provides broad satisfaction-based return protection.
Current model identity, firmness, height, price, delivery, and material claims.
Current satisfaction guarantee and exclusions.
Costco places the mattress under its satisfaction guarantee and does not state a fixed mattress-trial duration.
The policy is flexible, but it should not be interpreted as a conventional fixed-night manufacturer trial.
Eligible online returns can include shipping and handling refunds, with online and warehouse return routes available subject to product instructions.
The original purchase channel determines the practical return steps and whether pickup is needed.
The mattress carries a 10-year limited warranty alongside Costco's return policy.
Manufacturer defect coverage and retailer satisfaction returns are separate protections with different requirements.
Model checkedJul 16, 2026Current model
Configuration evaluatedSleep Science Copper Infused Firm · 14 inches · Firm 7/10 · Costco item 1232954
Copper-infused memory foamViscoelastic polyurethane foam with copper infusion · Comfort
1 inchProvides the primary contouring surface. Memory foam conforms under sustained load, spreading pressure over a larger contact area. Its thickness and position influence contour depth and how quickly the sleeper reaches firmer layers below.
Why it matters: Across the Sleep Science 14-inch Copper Infused Firm Mattress, back and stomach pressure patterns were broadly distributed. This is one of the layers most responsible for shoulder and hip cushioning; sleepers who dislike a close contour should compare it with the mattress’s recorded sinkage and recovery.
Copper-gel comfort foamPolyurethane foam with copper-gel infusion · Comfort
2 inchesCompletes the 3-inch comfort system and transitions into the support core. This foam distributes load through the comfort stack. Its position, thickness, and firmness matter more than a gel infusion or branded name alone when judging contour and support.
Why it matters: For the Sleep Science 14-inch Copper Infused Firm Mattress as a whole, back and stomach pressure patterns were broadly distributed. Near the surface it contributes more cushioning; deeper in the mattress it primarily moderates the transition into the support core.
Upper Air Grid support foamArticulated polyurethane support foam · Core
5.5 inchesAdds airflow channels and flexible support for adjustable bases. This foundation resists deep compression and keeps the comfort layers working on a stable plane; it is not intended to provide the mattress’s initial plushness.
Why it matters: In the finished Sleep Science 14-inch Copper Infused Firm Mattress, durability was assessed at 7/10 (Good). Its thickness and material quality are more relevant to long-term shape retention and bottoming-out resistance than to surface softness.
Lower support foam and wedge perimeterHigh-density polyurethane support foam · Base
5.5 inchesStabilizes the mattress and forms the perimeter support system. This reinforcement is intended to resist perimeter compression, helping the outer sleeping surface remain usable when someone sits or lies near the side.
Why it matters: Across the Sleep Science 14-inch Copper Infused Firm Mattress, lying support remained fair and the edge recovered quickly. The meaningful check is the finished mattress’s seated compression and lying stability, not the presence of an edge-support label by itself.
Value firm all-foam model: You want fast response, firm support, and Costco return protection.
Choose if: One of those exact constructions and firmnesses suits your position better.
Watch out: Their construction and firmness differ from the 14-inch Copper Infused Firm.
