Sersper PHA Gel-Infused Memory Foam Mattress Reviews (2026)

If you want quieter sleep and a gentle foam cradle without spending on a premium model, this mattress gets the job done. In our tests, it absorbed movement well and eased pressure at the shoulders and hips, especially when side sleeping. The tradeoff is a softer perimeter and a slower feel when you change positions.

• Who It’s For

  • Couples who are easily disturbed by partner movement

  • Side and back sleepers who like a medium, contouring feel

  • Guest rooms, first apartments, and budget-minded setups

• Who It’s Not For

  • People who need firmer edge support for sitting or getting in and out of bed

  • Strict stomach sleepers who want a flatter, more lifted surface

  • Very hot sleepers who need stronger cooling than basic gel foam can provide

We unboxed a 10-inch Queen, let it fully expand, and then used it over multiple weeks in our actual testing. We rotated through back and side sleeping, checked how deeply the foam compressed at the shoulders and hips, and ran repeatable couple-style disturbance tests. We also scored support, cooling, pressure relief, motion isolation, responsiveness, edge support, and durability with edge-sit checks, timed position changes, and temperature observations early and later in the night.

The bed felt slightly cool at first touch, then settled into a familiar slow-moving foam cradle once body heat warmed the top layer. On my back, it kept my lower back comfortable without feeling pushy through the middle of the mattress. Side sleeping was the better fit: in our testing, the foam spread pressure more evenly across the shoulders and hips and kept the surface from feeling sharp or jammed. The main drawback showed up when rolling over. There was a brief lag before the foam recovered, and the perimeter compressed more than we wanted when we drifted close to the edge.

• What we liked

  • Movement stayed quiet and did not travel far across the surface

  • Pressure relief felt even under the shoulders and hips

  • The center of the bed stayed consistently supportive in our tests

• Who it is best for

  • Light-to-average weight sleepers who like a medium foam cradle

  • Couples who care more about motion isolation than bounce

  • Guest-room use where simple setup matters

• Where it falls short

  • Edge support is only average for sitting and edge sleeping

  • Combination sleepers may want a quicker, more responsive surface

  • Cooling is noticeable at first, but it does not stay cool all night

• Model: PHA

• Type: gel memory foam mattress with foam comfort layers over a foam support core

• Profile options: 8", 10", 12", and 14" (availability varies by size)

• Tested configuration: 10-inch Queen

• 10-inch dimensions: Twin 39" x 75" x 10"; Full 54" x 75" x 10"; Queen 60" x 80" x 10"

• Feel: medium to medium-firm

• Setup: compressed in a box; allow 24 to 72 hours for full expansion

• Trial: 100-night trial with a 30-night adjustment period

• Warranty: 10-year limited warranty

• Shipping: Sersper lists 24-hour order processing and free standard shipping, but transit timing varies by page and location

Pick this mattress if you want a medium-feel foam bed that puts pressure relief and quiet sleep ahead of bounce. It fits side sleepers, back sleepers, and mixed-position sleepers best when they do not need a very firm, lifted feel. If you change positions constantly and want faster recovery, the Tuft & Needle Original is the more responsive foam alternative. If you are setting up a guest room on a tighter budget, the Zinus Original Green Tea Memory Foam Mattress is the more familiar entry-level comparison.

Edge support is the clearest compromise here. Sitting and sleeping near the perimeter feel less secure than they do on firmer foam beds or hybrids. Responsiveness is also just average, so frequent position changes come with a short delay as the surface catches up. Cooling helps at the start of the night, but hot sleepers may still want something with stronger airflow or a more temperature-neutral feel.

• Why choose this model

  • You want low-motion, quieter sleep

  • You prefer a medium foam cradle with good shoulder and hip relief

  • You want a simple bed-in-a-box with several profile options

• Alternatives to consider

  • Tuft & Needle Original Mattress: faster recovery and easier repositioning

  • Sealy Essentials 10" Gel Memory Foam Mattress-in-a-Box: a mainstream gel-foam alternative

  • Zinus Original Green Tea Memory Foam Mattress: a budget-friendly guest-room comparison

• Give it a full 24 to 72 hours to expand before judging firmness or support.

• Use a supportive, solid base so the foam does not feel softer or less stable than it should.

• If you sleep on your side, start with a slightly thinner pillow to keep your neck level.

• Rotate the mattress head to foot every few months to help even out wear.

• Try not to spend long periods sitting on the same edge if you want the perimeter to hold up better.

• If you sleep hot, pair it with breathable sheets and lighter bedding.

• Give your body a little time to adjust before deciding you need a topper or a new pillow.

• If the foam feels sticky when you turn, a stretchier fitted sheet can help the surface move a little easier.

• For guest rooms, a simple mattress pad is an easy way to fine-tune the feel.

In our testing, it read closer to medium for side and back sleeping, though it can edge toward medium-firm once the support core engages more deeply under the hips.

It was one of the better parts of the mattress in our tests. Movement stayed fairly localized, so partner turns were less disruptive than on bouncier beds.

It is usable, but not a strength. The edge compresses noticeably, especially if you sit there every day.

Not really. The surface feels cooler at first, but it does warm up as the night goes on.