Stressless is best known for ergonomic recliners, so we wanted to see whether that same “weightless” comfort translates to a mattress. The Sky and Sky Plush are modular hybrids built around zoned pocket springs and NordicSoft™ foam. In our hands-on testing, both models delivered a refined, cushioned feel with steady support and a breathable surface—while the premium pricing and softer comfort levels will narrow the audience. If you’re comparing a range of beds, it also helps to look at broader testing guidance and other reviews before you buy.
Table of Contents
Product Overview
| Mattress | Pros | Cons | Ideal for |
|---|---|---|---|
| Stressless Sky | Balanced, medium-soft feel; zoned support helps keep the hips from dropping; breathable surface; strong edge support for a softer hybrid | May feel too plush for many stomach sleepers; luxury pricing | Side sleepers and combination sleepers who want a softer hybrid that’s still easy to move on |
| Stressless Sky Plush | Extra plush layer adds deeper pressure relief; excellent motion isolation; supportive zoning still comes through | Too soft for many back and stomach sleepers; can sleep a bit warmer than Sky; thicker profile | Side sleepers and couples who want a softer, more enveloping feel |
Testing Team Takeaways
These two mattresses are closely related. Both use Stressless’ AdaptiveZones™ pocket spring system for targeted support, topped with a viscose-infused cloud layer designed to help with moisture and temperature control. The main difference is the Sky Plush: it adds a separate plush layer for a deeper, more “hugging” feel.
If you like a softer mattress but still want your spine to feel level, the standard Sky is the more balanced option. Sky Plush is the comfort-first pick—especially for side sleepers who want extra cushioning at the shoulders and hips. Neither is a great match for shoppers hunting for a true firm feel or a budget-friendly hybrid.
How We Tested It
We tested the Stressless Sky and Sky Plush using the same mattress testing standards we apply to every mattress we review. Over a two-week period, 25 testers rotated through both models, logging more than 75 hours of sleep time per mattress. We collected feedback on firmness, pressure relief, spinal support, cooling, motion isolation, and edge support.
We also ran objective checks like measuring sinkage and responsiveness, edge compression, and heat retention using infrared readings. Since these two models share a similar build, we tested them side by side to highlight the practical difference the added Plush layer makes. Our testing team includes Marcus Reed, Mia Chen, Jenna Brooks, and Dr. Adrian Walker.
Stressless Mattress: Our Testing Experience
Stressless Sky
Quick Summary
The Stressless Sky has a medium-soft feel that balances cushioning with support. It uses the AdaptiveZones™ spring system to keep your midsection from sinking too far, while the cloud layer adds a smooth, breathable surface. It’s the easier of the two models to move around on, and it held up well along the edges for a softer hybrid.
Our Testing Experience
On the Sky, our testers felt gently cradled without losing the “on-top” sensation that makes repositioning easy. Side sleepers got noticeable pressure relief at the shoulders and hips, while back sleepers generally felt supported as long as they didn’t prefer a firm mattress. The zoning did a good job of keeping the lower back and hips from dipping, which helped our combination sleepers stay aligned when switching positions.
Temperature-wise, the top layer felt cool and breathable, and it didn’t trap heat as quickly as many foam-heavy beds. Motion transfer was well controlled for a hybrid, and the perimeter had enough structure that sitting to put on shoes—or sleeping near the edge—didn’t feel unstable.
What we liked
- The zoned support kept hips and shoulders more level than most medium-soft hybrids.
- The surface stayed cool to the touch and never felt clammy overnight.
- Edge support was impressively steady for a softer, cushioned mattress.
Who it is best for
- Side sleepers who want pressure relief without an ultra-plush sink.
- Combination sleepers who change positions and prefer a responsive feel.
- Couples who want a blend of motion control and easy movement.
Where it falls short
- It may feel too soft for dedicated stomach sleepers.
- The price is high compared to many hybrid competitors.
- Heavier sleepers may need a firmer, more robust support system.
| Category | Score (out of 5) |
|---|---|
| Firmness & Support | 4.2 |
| Pressure Relief | 4.3 |
| Cooling | 4.1 |
| Motion Isolation | 4.1 |
| Edge Support | 4.0 |
| Overall Score | 4.1 |
Stressless Sky Plush
Quick Summary
The Stressless Sky Plush builds on the standard Sky by adding a 4-inch NordicSoft™ plush layer, bringing the height to 15 inches and creating a deeper, more enveloping feel. It’s the better option if you want extra cushioning and stronger motion isolation, but the softer surface can be too much for many back sleepers and stomach sleepers.
Our Testing Experience
Sky Plush feels noticeably plusher the moment you lie down. Side sleepers sank in a bit more at the hips and shoulders, which took pressure off sensitive spots and created that “cloudy” sensation the name suggests. At the same time, the AdaptiveZones™ support layer still helped keep the spine from bowing, so it didn’t feel sloppy—just softer and more conforming than the standard Sky.
The trade-off is mobility and heat. The extra foam layer made the surface slower to respond, and our combination sleepers had to work a little harder to change positions. Several testers also noted that it held onto more warmth than Sky, especially in deeper sink areas. Motion isolation, however, was excellent; partner movement was easy to ignore.
What we liked
- The added plush layer eased pressure around the hips and shoulders.
- Motion isolation was excellent—partner movement stayed muted.
- Even with the softer feel, the zoned support helped maintain alignment.
Who it is best for
- Side sleepers who want a deeper, more enveloping cushion.
- People with hip or shoulder sensitivity who prefer extra padding.
- Couples who are easily disturbed by motion.
Where it falls short
- It’s too plush for many back and stomach sleepers.
- It can sleep warmer than Sky because of the extra foam.
- It takes more effort to move around on than the standard Sky.
| Category | Score (out of 5) |
|---|---|
| Firmness & Support | 4.1 |
| Pressure Relief | 4.5 |
| Cooling | 4.0 |
| Motion Isolation | 4.3 |
| Edge Support | 3.9 |
| Overall Score | 4.2 |
Compare Performance Scores of These Mattresses
| Performance Category | Stressless Sky | Stressless Sky Plush |
|---|---|---|
| Support | 4.2 | 4.1 |
| Pressure Relief | 4.3 | 4.5 |
| Cooling | 4.1 | 4.0 |
| Motion Isolation | 4.1 | 4.3 |
| Edge Support | 4.0 | 3.9 |
On our 5-point scoring, Sky Plush came out slightly higher in pressure relief and motion isolation, while Sky had a small advantage in cooling and ease of movement. The differences are subtle, and comfort preference (balanced vs. plush) matters more than the decimal points.
Pros and Cons
Pros
- Modular design makes it easier to adjust comfort or replace layers over time
- Strong pressure relief for side sleepers, especially on Sky Plush
- Premium materials and a clean, well-finished build
- Very good motion isolation and better-than-average edge support for softer beds
Cons
- Expensive compared with many other hybrids
- The overall feel runs soft, with limited options for firm-bed sleepers
- Not a strong match for most stomach sleepers
- Sky Plush is thicker and slower to move on
Stressless Mattress vs. Alternatives
Stressless mattresses offer a distinctive feel and a modular approach, but they’re not the only premium options. If you want a firmer profile, a more traditional coil feel, or a mattress line with wider comfort range, these alternatives are worth considering:
- Saatva Classic – A luxury innerspring hybrid that comes in multiple firmness options and has a more buoyant, traditional feel.
- Tempur-Pedic ProAdapt – A high-end memory foam mattress that offers deeper contouring and a slower response for pressure relief.
- Beautyrest Black Hybrid – A premium hybrid with more firmness and performance options, often favored by sleepers who want stronger support.
Pro Tips for Stressless Mattress
- Use a supportive foundation or adjustable base to help the mattress perform as intended.
- Rotate the mattress periodically to promote even wear (especially during the first few months).
- If you’re unsure between models, prioritize your sleep position: Sky is easier to move on, while Sky Plush gives you more sink and cushioning.
- Pair the mattress with breathable bedding to support a more comfortable sleep temperature and take advantage of the cooling-focused top layer.
- Give it a short adjustment period—softer foams and springs can feel different during the first week.
Summary
The Stressless Sky and Sky Plush are luxury, modular hybrid mattresses built around zoned pocket springs and NordicSoft foam. Sky is the more balanced, medium-soft option: supportive enough for many side and combination sleepers, easier to reposition on, and still comfortably cushioned. Sky Plush adds a thick comfort layer for a deeper, softer hug and stronger motion isolation, making it the better pick if you want extra pressure relief. If you prefer a firm mattress or need a sturdier feel for higher body weights, it’s worth comparing alternatives before committing to either model.
FAQs
What types of sleepers are these mattresses best for?
Most of our testers who sleep on their side—or switch between side and back—preferred these mattresses. Sky has enough lift to work for many combination sleepers, while Sky Plush is a better match if you want a softer, deeper feel for hips and shoulders. Dedicated stomach sleepers, and some back sleepers who need a firmer surface, may find both models too plush.
Are Stressless mattresses good for couples?
They can be, especially if you’re sensitive to movement. Both models performed well for motion isolation, and Sky Plush did an even better job of absorbing partner movement. The edge support is also solid for a softer mattress, which helps couples use more of the sleep surface comfortably.
Do Stressless mattresses work with adjustable bases?
Yes. Both models are designed to be compatible with adjustable bases, and the split king configuration is a good fit if you and your partner prefer different positions.
Is the Sky Plush worth the extra cost?
It depends on how much you value extra cushioning. If you’re a side sleeper who wants deeper pressure relief, or you’re very sensitive to partner movement, Sky Plush can feel like a meaningful upgrade. If you prefer a slightly faster, more balanced surface—or you’re already on the fence about the price—the standard Sky is often the more practical choice.
