Sterling mattresses stand out for a practical idea: when a cover or comfort layer wears out, you can replace that part instead of the entire bed, which can extend the mattress’s useful life. Across the three verified models, the differences were easy to feel. The Imperial 675 provided the deepest cushioning, the Imperial 620 felt flatter and easier to move on, and the Hospitality 520 delivered the coolest surface and strongest edge support for shoppers seeking a hotel-style mattress.
Table of Contents
Sterling Models at a Glance
| Mattress | Overall Score | Best Feature | Main Trade-Off |
|---|---|---|---|
| Imperial 675 Euro Top | 4.5/5 | Deep cushioning and split firmness options | Slower response and a tall profile |
| Imperial 620 Plush Top | 4.3/5 | Balanced support and easy movement | Less pressure relief than the 675 |
| Hospitality 520 Plush Top | 4.4/5 | Cooling and edge support | Limited contouring for side sleepers |
Which Sterling Mattress Is Best?
Imperial 675 Euro Top
This is the best Sterling option for side sleepers, combination sleepers, and couples who want different firmness levels on each side. Its deeper comfort layers eased shoulder and hip pressure better than the other two models, though the 15-inch profile requires deep-pocket sheets and makes the bed harder to climb into for some sleepers.
Imperial 620 Plush Top
Choose the 620 if you are a back sleeper who wants a supportive, moderately firm surface without the height or slower response of the 675. It kept the hips level during back sleeping and made position changes easy, but lightweight side sleepers may find the top too shallow at the shoulder.
Hospitality 520 Plush Top
The 520 is the strongest choice for hot sleepers, couples who use the full width of the bed, and anyone who likes a buoyant hotel mattress. Its reinforced coil perimeter felt more secure than the foam rails on the Imperial models. The trade-off is less contouring, especially during longer side-sleeping sessions.
How the Sterling Models Compare
| Feature | Imperial 675 Euro Top | Imperial 620 Plush Top | Hospitality 520 Plush Top |
|---|---|---|---|
| Reviewed height | 15" | 12" | 12" |
| Support core | 6" pocket coils | 6" pocket coils | 8" Quantum Edge Bolsa pocket coils |
| Edge system | Foam encasement | Foam encasement | Quantum Edge coils |
| Comfort options | Configurable Euro-top layers, including split firmness | Replaceable plush top and comfort components | Replaceable plush top and comfort components |
| Current sizing | Varies by retail or hospitality order | Varies by retail or hospitality order | Varies by retail or hospitality order |
| Cooling | Good | Good | Best of the three |
| Pressure relief | Deepest | Moderate | Moderate |
| Response | Moderate | Fast | Fastest |
| Consumer warranty | 20-year limited/pro-rated | 20-year limited/pro-rated | 20-year limited/pro-rated |
How We Evaluated the Sterling Line
Marcus, Carlos, and Mia followed the same mattress evaluation routine on each model. The group covered body weights from 130 to 210 pounds and included primary side, back, and combination sleepers. We measured the finished height, rated firmness on a 10-point scale, recorded compression under a 200-pound load, tracked surface temperature for 30 minutes, and timed the comfort layers as they recovered after the load was removed. We also used repeated six-inch ball drops to compare motion transfer. These observations fed into our 5-point ratings for support, cooling, pressure relief, motion isolation, responsiveness, and edge support.
Sterling Mattress: Our Testing Experience
Imperial 675 Euro Top
Our Testing Experience
Our sample measured 14.9 inches and felt like a 6 out of 10 for firmness in its softer configuration. The Euro top let Mia’s shoulder and outer hip settle in without pulling her waist downward, while the pocket-coil core held Marcus’s midsection level during back sleeping. A 200-pound load compressed the edge by 2.0 inches, close enough to the center measurement that lying near the side never felt precarious. After 30 minutes, the surface warmed by 4.8°F, and the top recovered to 90% of its original height in 2.4 seconds. That slower recovery was noticeable during quick turns, but it also helped absorb more of the initial movement than the 620 or 520.
What we liked:
- The deepest shoulder and hip cushioning in the lineup
- Reliable lower-back support without excessive sink
- Split firmness choices that solve a real problem for couples
Who it is best for:
- Combination sleepers who spend part of the night on their side
- Side sleepers who need more cushioning at the shoulder and hip
- Couples who prefer different firmness levels
Where it falls short:
- The Euro top responds more slowly than the other Sterling models
- The tall profile may require deep-pocket sheets and a lower foundation
- It retains slightly more warmth than the Hospitality 520
Details
- Build: the reviewed hospitality configuration has a 15-inch profile, a quilted Euro top, 6-inch fabric-encased pocket coils, and foam-encased edges.
- Comfort system: modular layers can be replaced, and Euro-top configurations support separate comfort choices on each side.
- Buying information: Sterling currently groups the 620, 625, and 675 within its configurable Imperial retail line. Sizes and available layer combinations vary by channel.
- Warranty: current consumer terms list a 20-year limited/pro-rated warranty; hospitality contracts may use different terms.
Review Score
The Imperial 675 earned 4.5/5 overall, led by support at 4.7/5, pressure relief at 4.6/5, and durability at 4.7/5.
Imperial 620 Plush Top
Our Testing Experience
The 620 sample measured 12.1 inches and landed at 6.5 out of 10 for firmness. Its tighter plush top produced 1.5 inches of sink under a 44-pound load, compared with 1.8 inches on the softer 675 configuration. Carlos stayed level through the hips during extended back-sleeping sessions, and none of the testers needed to push against the mattress to turn over. The edge compressed 2.2 inches under a 200-pound load, and the surface recovered to 90% height in 1.7 seconds. Those numbers matched the experience: the 620 felt supportive and responsive, with enough cushioning for occasional side sleeping but not enough for a lightweight side sleeper who is sensitive at the shoulder.
What we liked:
- Even support under the hips and lower back
- Quick, uncomplicated position changes
- Useful edge support for sitting and near-edge sleeping
Who it is best for:
- Back sleepers who want a medium-firm feel
- Combination sleepers who change positions often
- People who regularly sit or sleep near the edge
Where it falls short:
- Less cushioning at the shoulder and hip than the 675
- Too firm for many lightweight side sleepers
- The surface feels supportive rather than luxuriously plush
Details
- Build: the reviewed hospitality configuration has a 12-inch profile, a quilted plush top, 6-inch pocket coils, and a fully foam-encased perimeter.
- Comfort system: the zippered cover and internal comfort components can be replaced as they wear.
- Buying information: the 620 remains part of Sterling’s active Imperial line, though sizes and top configurations differ between direct retail and hospitality orders.
- Warranty: current consumer terms list a 20-year limited/pro-rated warranty; hospitality contracts may use different terms.
Review Score
The Imperial 620 earned 4.3/5 overall. Its strongest results were support at 4.5/5, durability at 4.6/5, and edge support at 4.4/5.
Hospitality 520 Plush Top
Our Testing Experience
The Hospitality 520 measured 12.0 inches and felt like a 6.7 out of 10 for firmness. Its 8-inch Quantum Edge coil unit created the most consistent support from the center to the side: a 200-pound load compressed the edge by 1.7 inches, the lowest result of the group. The surface temperature rose 3.2°F over 30 minutes, also the smallest increase, and the comfort layers recovered to 90% height in 1.2 seconds. During the repeated ball drops, vibration settled in an average of 0.8 seconds. Couples should still expect some spring movement, but the bed stayed composed when one tester rolled toward the edge. The firmer, buoyant top worked especially well for back sleeping; Mia noticed shoulder pressure earlier here than on the 675.
What we liked:
- The coolest surface temperature in the comparison
- Strong edge support that preserves more usable sleep space
- A responsive, even feel that suits back and combination sleepers
Who it is best for:
- Hot sleepers who prefer an innerspring feel
- Couples who use the full width of the mattress
- Back and combination sleepers who like a supportive hotel bed
Where it falls short:
- Limited contouring for lightweight and pressure-sensitive side sleepers
- More noticeable spring response than a slow-moving foam mattress
- No split-firmness system comparable to the 675 Euro Top
Details
- Build: the reviewed hospitality configuration has a 12-inch profile, an aloe-vera-treated quilted cover, and an 8-inch Quantum Edge Bolsa pocket-coil unit.
- Comfort system: the zippered cover and internal comfort layers are modular and replaceable.
- Buying information: the 520 remains in Sterling’s active hospitality lineup and is also listed through its guest-purchase channel. Size availability depends on the order channel.
- Warranty: current consumer terms list a 20-year limited/pro-rated warranty; hospitality specifications list a 10-year warranty.
Review Score
The Hospitality 520 earned 4.4/5 overall. Its best results were cooling at 4.3/5, responsiveness at 4.4/5, edge support at 4.5/5, and durability at 4.5/5.
Which Sterling Mattress Should You Choose?
Start with your sleep position and sensitivity to pressure points. If you spend most of the night on your side or regularly wake with a sore shoulder or hip, the Imperial 675 is the clear choice because its deeper Euro top allows more contouring. Back sleepers and frequent position changers should favor the Imperial 620 for its flatter support and faster response. Choose the Hospitality 520 when cooling, edge support, and a buoyant hotel feel matter more than deep cushioning. Also account for bed height: the reviewed 15-inch 675 can be awkward on a tall foundation, while the 12-inch models are easier to fit into an existing setup.
What to Know Before You Buy
- Match the comfort layer to your primary sleep position. Side sleepers generally need more shoulder and hip cushioning, while back sleepers usually benefit from the flatter 620 or 520 surface.
- Sleep on the mattress for several nights before judging the firmness. The quilted cover settles slightly, and a short mattress trial may not reflect its regular feel.
- Use a rigid, center-supported foundation. A flexible base can make the edges feel weaker and may affect warranty coverage.
- Check the combined height of the mattress, foundation, and frame before choosing the 675. A lower foundation can keep the sleep surface at a comfortable height.
- Rotate the mattress regularly to spread wear across the comfort layers, but do not flip this one-sided design.
FAQs
Which Sterling mattress is best for side sleeping?
The Imperial 675 provided the most pressure relief at the shoulder and outer hip. Its deeper Euro top made it the strongest choice for dedicated side sleepers and anyone sensitive to pressure buildup.
Which Sterling mattress stayed coolest during testing?
The Hospitality 520 recorded the smallest temperature increase and released heat quickly after a position change. Its taller coil unit also leaves more room for airflow than the denser Euro top on the 675.
Which model works best for couples?
The right choice depends on the couple. The Imperial 675 offers split firmness and better initial motion control for couples, while the Hospitality 520 provides stronger edges and more usable width. Couples who move easily between sleep positions may prefer the faster response of the 520.
