Evidence-based analysis of the GravityLux Memory Foam Mattress. Quantifying changes in sagging, firmness, and cooling efficiency based on density metrics and owner data.
Updated · By SleepUnpacked Research Team
The WinkBed GravityLux is a strong all-foam pick if you want durable support with lasting cooling: its high-density AirCell foam produces a lower modeled relative risk of deep sagging in the first three years, and the GelFlex polymer holds its airflow over time, so cooling stays stable. The main change to expect is a moderate firmness drop as the comfort layers break in during year one. We project a 6–8 year comfort life for average-weight sleepers on a proper foundation.
WinkBeds’ all-foam model, sold in Soft, Medium, and Firm. WinkBeds identifies Medium as the most popular, and the fit table on this page is Medium-specific — the independent lab publishes a separate table for each option and they differ sharply. Not to be confused with The WinkBed or the EcoCloud, both of which are coil hybrids.
A TENCEL cover quilted with gel-infused foam over patented AirCell memory foam, a zoned Progression Foam transition layer, and an ATLAS Core base at 1.8 lb density. AirCell is a non-visco memory foam built around air capsules, which is why it behaves differently from conventional memory foam.
The middle of three options, measured at 5 of 10. Soft measures 4 and Firm measures 7, and the fit results diverge dramatically between them: Firm is the only option that suits stomach sleepers, while Soft is the only one that strongly suits lighter side sleepers.
Confirmed identically by WinkBeds and by independent measurement, and consistent across all three firmness options.
Expensive for an all-foam mattress, and priced level with the coil-hybrid WinkBed Original on the checked date. WinkBeds discounts periodically, so the sale figure is closer to the effective everyday price; the independent reviewer recorded a $1,427–$2,856 range across sizes.
You must keep the mattress at least 30 nights before requesting a return or exchange. That matters more than usual here, because choosing the wrong firmness of three is the most likely way to be unhappy with this bed.
Ships via ground courier in roughly a week. Free to the contiguous US.
Returns are free with scheduled pickup and a refund within about five days. Exchanging for a different firmness carries a $49 fee — worth knowing given how much the three options differ.
Covers defects in workmanship and materials, and indentations exceeding 1.5 inches. On an all-foam mattress rated 6.5/10 for materials durability, that 1.5-inch threshold is the number that matters most.
Best-for and avoid-if guidance is Sleep Unpacked editorial analysis. Purchase terms can change; use the linked official source before ordering.
Project estimated degradation curves over 5 years based on your specific profile. Data derived from our predictive modeling of AirCell™ foam density. Our evaluation standards for this category are documented in the best luxury mattress long-term value methodology.
Proj. Sag @ Year 5
~0.4"
Firmness Drop
18%
Cooling Perf.
Stable
Modeled relative risk of issues within the first 3 years based on density specs and failure reporting. For the adjacent failure data, see the DreamCloud Premier Rest plush-hybrid comparison notes.
Low risk due to high-density AirCell™ foam. Primarily seen in foundations with improper slat spacing.
Moderate likelihood. Comfort layers naturally break in, resulting in a slightly plusher feel over year 1.
Dependant on usage. Sitting on the edge regularly accelerates foam fatigue in the perimeter rails.
Very low risk. GelFlex polymer does not compress like fiber, maintaining airflow channels over time.
Tracking material specifications across generations to identify potential durability drift.
Cover Pilling
Tencel covers are soft but prone to abrasion. Recommended use of protector.
Zipper Integrity
Reported issues in early Gen 1 models; reinforced in Gen 2.
This Living Review relies on a mixed-methods approach to filter marketing noise from durability facts.
Each result is labeled by evidence type. A measurement is not converted into a 10-point rating, and an untested metric stays unscored.
Medium (5/10)
The middle of three options at a true 5 of 10. Because the three options differ so much in fit, the firmness you choose matters more on this mattress than on almost any other reviewed here.
Sleep Foundation Test Lab8 / 10 — rated across all three firmness options
The strongest attribute. Note the independent lab rates these seven metrics for the GravityLux as a model rather than per firmness, so read this as a family-level result; only the fit table below is Medium-specific.
Sleep Foundation Test Lab7.5 / 10 — rated across all three firmness options
Reasonable for an all-foam bed with no coil layer to move air. The gel-infused quilted cover and the air-capsule structure of AirCell do most of the work.
Sleep Foundation Test Lab7.5 / 10 — rated across all three firmness options
Good but not exceptional, which is mildly surprising for an all-foam build. AirCell’s faster recovery means it absorbs slightly less movement than traditional memory foam would.
Sleep Foundation Test Lab7.5 / 10 — rated across all three firmness options
Better than most all-foam mattresses manage. The air-capsule structure springs back rather than holding a contour, so repositioning is easier than on a conventional memory-foam bed.
Sleep Foundation Test Lab7.5 / 10 — rated across all three firmness options
Respectable for a foam mattress with no reinforced perimeter, helped by the dense ATLAS Core base resisting compression at the sides.
Sleep Foundation Test LabNot reported for the current version
No published noise measurement was found. An all-foam build has no springs to develop noise with age, but no rating is assigned without a measurement.
These fit calls are specific to the Medium option. The independent lab publishes a separate table for each of Soft, Medium, and Firm, and they differ sharply — the Firm version is the only one that suits stomach sleepers, and the Soft the only one that strongly suits lighter side sleepers.
Tested 8 on the Medium option — the best cell in this configuration.
Tested 7.5; workable, though the Soft option scores higher for lighter side sleepers.
Tested 6. Foam alone struggles to keep the shoulder and hip aligned at this load — the Firm option tests better here.
Tested 7.5; supported, though a medium all-foam surface gives more under the lumbar curve than coils would.
Tested 6 — hips begin to settle with nothing beneath to push back.
Tested 6. The Firm option reaches 8 in this band and is the better choice for back sleepers at higher weight.
Tested 6.5 — even light stomach sleepers find a medium foam surface lets the midsection dip.
Tested 6; hips sit below the shoulders, the classic alignment failure for this position on soft foam.
Tested 5.5, the weakest cell on this option. The Firm GravityLux tests 7 here and is the only version worth considering.
A 7.5/10 ease-of-movement result makes moving easy, but only side sleeping scores well at this weight.
Movement itself is comfortable, yet back and stomach both sit at 6 — there is little to move between.
Every position scores 6 or below in this band, so the ease of movement has nowhere useful to take you.
Fit calls are editorial interpretations of cited third-party testing, not clinical recommendations. Exchanging firmness during the trial costs $49, so choosing correctly first matters on this model.
Our analysis projects a comfort life of roughly 6–8 years for average-weight sleepers. The high-density AirCell foam resists fatigue well, so sagging past 1 inch is low-risk; the more likely change is a moderate firmness drop as the comfort layers break in over the first year.
Our model assigns a lower relative risk of a greater-than-1.0-inch impression within the first three years, but this is directional rather than an observed incidence rate. Foundation support and slat spacing remain important variables.
WinkBed requires a rigid foundation with slats less than 3 inches apart, and an unsupported base is a common warranty-denial reason. The warranty covers visible sagging greater than 1.5 inches, and claims require photos.
Our model assigns a lower relative risk of cooling decline because the polymer structure preserves airflow channels better than compressed fiber. This is a directional outlook; hot, humid conditions remain an uncertainty.
Conclusion:For conclusion-level comparison, review Amerisleep AS3 Hybrid pressure-relief durability review.
Methods:For methods and material assumptions, review best side sleeper pressure-relief picks.
Conclusion:For conclusion-level comparison, review mattress warranty claim documentation checklist.
Next Step:For your next decision step, review mattress firmness calibration guide.
Methods:For methods and material assumptions, review WinkBed GravityLux specs, sizes & pricing.