Sersper PHA Gel Memory Foam Mattress Review

At 3.8 out of 5, the Sersper PHA earns a clear recommendation for shoppers who value quiet sleep and pressure relief more than bounce. Its motion isolation was especially effective, and the shoulders and hips had enough room to settle during side sleeping. It is less convincing at the perimeter, where the foam compresses noticeably, and its slow recovery can make frequent position changes feel labored. Choose it for a calm, cushioned foam feel—not for firm edges or strong all-night cooling.

• Who It’s For

  • Couples who wake easily when a partner turns over

  • Side and back sleepers who like a medium, body-contouring surface

  • Guest rooms, first apartments, and budget-conscious bedrooms

• Who It’s Not For

  • Anyone who relies on a firm edge for sitting down or getting out of bed

  • Strict stomach sleepers who need their hips held closer to the surface

  • Very hot sleepers who need steady airflow rather than a brief cool touch

A 10-inch Queen was given 72 hours to expand before several weeks of use. The review followed our standard mattress testing process, with back and side sleeping, controlled weight checks, timed position changes, edge sitting, temperature readings, and repeatable disturbance tests. The results were scored for support, cooling, pressure relief, motion isolation, responsiveness, and edge support.

The review sample reached 9.8 inches after 72 hours and felt like a 6 out of 10 for firmness. On my back, the foam filled the space under my lower back without pushing the hips too far down. Side sleeping was the better match because the top layer let the shoulder and hip settle gradually instead of creating sharp pressure. A 44-pound weight sank 2.0 inches at the center and 2.8 inches near the edge, which matched the stable middle and weaker perimeter we felt while lying down. Motion control was the standout: after a 10-pound ball was dropped from 6 inches, vibration at a sensor 24 inches away settled in 0.8 seconds. The surface warmed from 72.3°F to 78.5°F after 30 minutes and dropped 3.2°F within 10 minutes of getting up, so the gel foam took the edge off the initial warmth but did not stay cool. Repositioning required more effort than on responsive foam; after the weight was removed, the surface took 4.3 seconds to recover 90% of its height.

• What we liked

  • Movement stayed quiet and localized, even during sharper turns

  • The top layer cushioned the shoulder and hip evenly during side sleeping

  • The center stayed level enough for comfortable back sleeping

• Who it is best for

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

  • Couples who would trade bounce for better motion isolation

  • Guest rooms where easy delivery and broad comfort matter

• Where it falls short

  • The edge compresses too much for confident daily sitting

  • Combination sleepers may find the slow recovery restrictive

  • Cooling is modest and fades as the foam absorbs body heat

• Model: PHA

• Type: gel-infused memory foam comfort layers over an all-foam support core

• Height options: 8, 10, 12, and 14 inches; available sizes vary by height

• Tested size: 10-inch Queen

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

• Tested feel: medium, about 6/10

• Setup: compressed and boxed; allow up to 72 hours for full expansion

• Trial: Sersper advertises a 100-night mattress trial with a 30-night adjustment period, but the same return page also lists general 30-day conditions. Confirm the terms that apply to your order before buying.

• Warranty: 10-year limited warranty for qualifying original purchases

• Shipping: orders are typically processed within 24 hours, while the product page says mattresses ship in 1–3 business days. Standard shipping is free within the contiguous United States, and delivery time varies by destination.

Choose this mattress if you want a medium all-foam bed that puts pressure relief and quiet sleep ahead of bounce. It best suits side sleepers and back sleepers who are comfortable with a slow, close contour. Frequent position changers will get a faster response from the current Tuft & Needle Original. For a lower-cost guest-room setup, the Zinus Original Green Tea Memory Foam Mattress is a simpler entry-level comparison, though its direct-sale version does not offer the Sersper’s gel-infused comfort layer.

Edge support is the biggest compromise. The perimeter sinks more deeply than the center, so sitting there every morning or sleeping at the very edge feels less secure than it does on firmer foam beds or hybrids. The slow rebound also works against restless combination sleepers. Finally, the gel foam softens the first contact with heat, but it does not create the steady airflow that very hot sleepers need for a temperature-neutral sleep setup.

Sersper PHA: Choose it when low motion transfer, a medium memory-foam contour, and several height options matter more than bounce. Among these choices, it offers the most direct balance of gel foam, pressure relief, and a quiet surface.

Tuft & Needle Original: The current Original uses fast-recovery foams and feels more buoyant, making turns easier. It is the better choice for combination sleepers, while the Sersper does a better job of delivering a classic slow memory-foam hug.

Sealy Essentials 10-inch Gel Memory Foam Mattress-in-a-Box: This Sealy Essentials model is the closest mainstream gel-foam comparison, with 2 inches of gel memory foam over an 8-inch support base. Retailer stock varies by size, but it suits shoppers who prefer a familiar national brand.

Zinus Original Green Tea Memory Foam Mattress: The 10-inch Zinus is the straightforward budget choice for a guest room or first apartment. It has a similarly slow foam character, but the current direct-sale model uses green-tea memory foam rather than a gel-infused comfort layer.

• Wait the full 72 hours before judging the final height or firmness.

• Use a firm, supportive base so the foam does not sag or feel softer than intended.

• Side sleepers can start with a slightly thinner pillow to keep the neck aligned after the shoulder sinks in.

• Rotate the mattress from head to foot every few months to distribute wear.

• Avoid sitting in the same spot along the edge every day.

• Use breathable sheets and light bedding if you tend to sleep warm.

• Give your body at least a few weeks to adjust before adding a topper.

• If a tight fitted sheet slows the foam further, switch to one with more stretch.

• A thin mattress pad can make the surface easier to maintain in a guest room without changing the feel much.

The tested 10-inch model felt medium, about 6 out of 10. The support core pushes back more under deeper compression, but the overall surface does not feel firmly lifted.

It is the mattress’s strongest feature. Partner turns stay localized, so movement is less disruptive than it is on bouncier foam or coil beds.

It is usable for short periods, but it compresses noticeably and is not a good choice for anyone who depends on a firm edge every day.

No. The surface starts slightly cool, then warms as the memory foam absorbs body heat. Very hot sleepers should choose a mattress with stronger airflow.