Mostly Mattress Reviews (2026)

The Helix models were the strongest overall performers, but they suited different positions. Marcus preferred the Dusk’s steadier hip support during back and stomach sessions. Jenna and Ethan favored the Midnight when they spent more time on their sides because it cushioned the shoulders without letting the hips drop too far. The Dunham felt noticeably plusher than either Helix and still made position changes easy, though partner movement traveled farther across its surface.

The Midnight is the best starting point for most shoppers in this group. Choose the Dusk if hip support and easy movement matter more than shoulder cushioning, or the Dunham if you want a softer, more traditional Euro-top feel.

Each mattress went through the same sequence of back and side sleep, with shorter stomach-sleep sessions where the construction made sense. We repeated the checks after the initial adjustment period and rated seven areas on a 5-point scale: support, cooling, pressure relief, motion isolation, responsiveness, edge support, and durability.

Position changes showed how quickly each surface recovered, edge-sit and edge-lie checks revealed how much usable space the perimeter provided, and partner movement showed how far vibration traveled. For cooling, we compared the initial surface feel with the amount of heat that built up during longer periods without changing position.

Our Testing Experience

The 12.5-inch Midnight settled into a clear medium feel within the first few nights. On my side, the shoulder sank enough to avoid a sharp pressure point while the hip stopped before the lower back began to bow. That balance held up when moving between side and back positions, which is why its 4.5/5.0 pressure-relief score felt earned rather than simply soft.

The GlacioTex pillow top felt cool as soon as we lay down. It did not remain cold, but heat built more slowly during longer still periods than it did on the Dunham. In partner-movement checks, turns registered as a small surface tremor instead of a broad ripple. The trade-off appeared at the perimeter: sitting and lying close to the edge produced more compression than on the Dusk, although the edge still felt usable.

What we liked:

• Balanced cushioning at the shoulders and hips without a deep, slow sink

• A noticeably cooler surface when first getting into bed

• Better motion control than its springy hybrid construction suggests

Who it is best for:

• Side sleepers who need pressure relief without losing hip support

• Combination sleepers who want a medium surface that is easy to move across

• Couples who sleep warm but do not want an especially bouncy bed

Where it falls short:

• The perimeter compresses more than the Dusk when sitting or lying near the edge

• The GlacioTex pillow top adds a significant upgrade cost

Pros & Cons

Details

• Feel: Medium (6/10)

• Type: Hybrid with foam over wrapped coils

• Height: 12.5 in with the GlacioTex Cooling Pillow Top

• Cooling: Optional cool-touch GlacioTex pillow top

Review Score

Our Testing Experience

The 12.5-inch Dusk also felt medium, but its support was more noticeable through the middle of the body. On my back, the hips stayed closer to the surface than they did on the Midnight. Short stomach sessions showed the same difference: the midsection felt better supported, with less effort needed to keep the lower back neutral.

The Dusk recovered quickly after a turn, so moving from back to side required little leverage from an elbow or forearm. Its surface transmitted slightly more partner movement than the Midnight, but the vibration faded quickly. The GlacioTex pillow top provided the same immediate cool-touch sensation as it did on the Midnight, while the perimeter stayed steadier during edge-sit checks.

What we liked:

• Stronger support through the hips for back and stomach positions

• Quick surface recovery that made position changes easy

• A cooler initial surface without giving up the lift of a hybrid

Who it is best for:

• Back sleepers who want a medium feel with more support under the hips

• Stomach sleepers who do not want an extra-firm mattress

• Combination sleepers who prioritize easy movement and a steadier edge

Where it falls short:

• Side sleepers may want more cushioning at the shoulder than the Dusk provides

• Partner movement is more noticeable than on the Midnight

Pros & Cons

Details

• Feel: Medium

• Type: Hybrid with responsive foam over wrapped coils

• Height: 12.5 in with the GlacioTex Cooling Pillow Top

• Cooling: Optional cool-touch GlacioTex pillow top

Review Score

Our Testing Experience

The Dunham had the softest first impression of the three. Its quilted Euro top allowed more surface-level sink at the shoulder and hip, while the encased coils kept the mattress from feeling loose through the middle. Compared with the Midnight, the cushioning felt broader and less closely contoured.

Changing position was still straightforward because the coil system brought the surface back quickly. Heat buildup was moderate: the Dunham lacked the immediate cool touch of the GlacioTex models, but it did not feel stuffy during the longer still periods. Partner movement traveled farther than it did on either Helix, making the Dunham a better choice for plush comfort than for especially light sleepers sharing a bed.

What we liked:

• A plush Euro top that softened contact at the shoulders and hips

• Enough coil support to prevent the surface from feeling unstable

• Faster, easier repositioning than a slow-response foam bed

Who it is best for:

• Sleepers who prefer a cushioned, traditional Euro-top feel

• Combination sleepers who want softness without feeling trapped

• Couples who agree on a plush surface and are not highly sensitive to movement

Where it falls short:

• More partner movement crosses the mattress than on either Helix

• The surface lacks the immediate cooling sensation of GlacioTex

Pros & Cons

Details

• Type: Euro-top hybrid with encased coils

• Trial: Mostly Mattress 100-night comfort guarantee with a one-time exchange

• Delivery: Free local delivery on purchases over $699 in eligible service areas

Review Score

The Midnight led on pressure relief and cooling, while the Dusk posted the strongest support and responsiveness scores. The Dunham stayed close on support and pressure relief, but its lower motion-isolation score reflects the extra movement we felt across the Euro-top surface. Overall, the Midnight is the most balanced option; the Dusk is the more position-specific support choice, and the Dunham is the plushest.

Start with sleep position. The Midnight is the safest choice for side sleepers and people who move between side and back because it combines shoulder cushioning with steady hip support. The Dusk works better for back and stomach sleepers who want more lift through the middle without moving to an extra-firm surface. Choose the Dunham when a cushioned Euro top matters more than cool-touch fabric or strong motion isolation.

Next, consider temperature and movement. Both GlacioTex models feel cooler when you first get into bed and slow heat buildup better than the Dunham. For couples, the Midnight provides the best motion control of these three, while the Dusk makes turning easiest. If you buy in a Mostly Mattress store, confirm the exact comfort-exchange and delivery terms for your location; direct Helix orders follow Helix’s separate online policies.

GlacioTex changes the first-contact feel and slows heat buildup, but it does not keep the mattress cold all night. It also adds to the price. The Midnight cushions the shoulder well but has more edge compression than the Dusk. The Dusk supports the hips better, though dedicated side sleepers may find it less forgiving. The Dunham delivers the softest surface of the three, but more partner movement crosses the bed and its publicly available specifications are limited.

Saatva Classic is the better alternative for shoppers who want a traditional, buoyant innerspring feel and more ways to tune the bed. It comes in three comfort levels and two heights, with a Euro pillow top and added lumbar emphasis. It feels livelier than the Midnight and is a stronger fit when firmness choice and in-room delivery matter more than a cool-touch surface.

Brooklyn Bedding Aurora Luxe Cooling is the most direct alternative to the GlacioTex models. It is a cooling-focused hybrid with three firmness choices and an optional pillow top. Consider it if temperature control is the first priority and you want to choose a softer or firmer feel instead of staying with Helix’s medium setup.

The WinkBed is a 13.5-inch Euro-pillow-top hybrid with four firmness options and a reinforced perimeter. Its more buoyant feel and stronger edge focus make it a sensible alternative to the Dunham, especially for shoppers who want a plush top but also need a clearly defined firmness choice.

• Give the mattress enough time to settle before judging the feel.

• Use a rigid, supportive foundation with closely spaced slats for a hybrid.

• Pair a cooling surface with breathable sheets instead of a thick, heat-trapping protector.

• Spend several minutes in your usual sleep position, not only on your back.

• Check whether your hips stay level during a short back or stomach session.

• If you share the bed, have your partner turn and get up while you remain still.

• Confirm whether the seller’s comfort policy is a refund or a one-time exchange.

No. It feels coolest when you first get into bed and slows heat buildup, but body heat gradually warms the surface. Breathable sheets help preserve the cooling effect.

The Helix Midnight isolated motion best among these three. The Dusk is a close second and feels easier to turn on, while the Dunham transfers more movement across its plush surface.

The Helix Dusk responded fastest when changing positions. Its medium surface felt supportive through the middle without creating a deep pocket around the body.

Start with the Helix Midnight. Its medium feel, balanced pressure relief, controlled motion, and cool-touch option cover the widest range of needs in this group. Choose the Dunham instead only if you already know you prefer a distinctly plush Euro top.