Novaform Serafina Pearl vs SweetNight CoolNest: Which Mattress Is Better?

Tested using Methodology v1.2

Updated Aug 28, 2026 03:48 PM

This review is in Early access

See Novaform Serafina Pearl Review

Mattress Type Foam

Bed-In-A-Box Yes

Upper Comfort Foam @ LumbarMemory Foam

Firmness Level Medium (44 Pa/mm)

Mattress Type Foam

Bed-In-A-Box Yes

Upper Comfort Foam @ LumbarMemory Foam

Firmness Level Medium-Plush (39 Pa/mm)

Recommended in 3 articles:
Back Pain
Memory Foam
Mattresses-In-A-Box

Our Verdict

Novaform Serafina Pearl

SweetNight CoolNest

Full comparison details regarding individual product score sets can be found in the section below

Variants

Serafina Pearl (Plush) (King)
Serafina Pearl (Plush) (Queen)

CoolNest (14") (California King)
CoolNest (14") (Full)

Review

See SweetNight CoolNest Review

Check Price

California King

CoolNest (14")

Full

CoolNest (14")

King

Serafina Pearl (Plush)

King

CoolNest (14")

Queen

Serafina Pearl (Plush)

Queen

CoolNest (14")

Twin

CoolNest (14")

SweetNight

Main Differences for

Side Sleeping

Threshold

0.10

Side Sleeping

7.8

0.0

No major differences between these mattresses for side sleeping. See full list of tests below.

Full Comparison

Side Sleeping

7.8

0.0

Back Sleeping

7.5

0.0

Stomach Sleeping

7.3

0.0

Longevity

6.8

0.0

Pressure Relief

7.9

0.0

Support

7.3

0.0

Cooling

7.9

0.0

Motion Dissipation

8.4

0.0

Responsiveness

6.6

0.0

Design

Style

Style Picture

SAMPLE

for pictures & test results

Mattress Type

Foam

Locked

Bed-In-A-Box

Yes

Locked

Quilted Top Layer

Locked

Grab Handles

Yes

Locked

Thickness

35.8 cm (14.1")

Lock cm (Lock")

Performance

Firmness

Head/Feet Firmness

Preview Graph

SAMPLE

for pictures & test results

Lumbar Firmness

Preview Graph

SAMPLE

for pictures & test results

Firmness Video

SAMPLE

for videos & test results

Normalized Stiffness @ Head/Feet

42 Pa/mm

Lock Pa/mm

Normalized Stiffness @ Lumbar

44 Pa/mm

Lock Pa/mm

Firmness Level

Medium (44 Pa/mm)

Locked

Body Conformity

8.2

N/A

Shoulder Indentation vs. Body Weight

Preview Graph

SAMPLE

for pictures & test results

Body Conformity Picture 1

SAMPLE

for pictures & test results

Body Conformity Picture 2

SAMPLE

for pictures & test results

Indent @ 50 kg (110 lb)

55 mm (2.2")

Lock mm (Lock")

Indent @ 80 kg (176 lb)

79 mm (3.1")

Lock mm (Lock")

Indent @ 110 kg (242 lb)

97 mm (3.8")

Lock mm (Lock")

Support

7.3

N/A

Pelvis Indentation vs. Body Weight

Preview Graph

SAMPLE

for pictures & test results

Indent Difference @ 50 kg (110 lb)

19 mm (0.7")

Lock mm (Lock")

Indent Difference @ 80 kg (176 lb)

19 mm (0.8")

Lock mm (Lock")

Indent Difference @ 110 kg (242 lb)

20 mm (0.8")

Lock mm (Lock")

Bounciness

2.2

N/A

Bounciness Video

SAMPLE

for videos & test results

Maximum Rebound Height

2.0 cm (0.8")

Lock cm (Lock")

Comfort Layers Envelopment

6.6

N/A

Sinking & Contouring Picture

SAMPLE

for pictures & test results

Sinking Depth

5.4 cm (2.1")

Lock cm (Lock")

Diameter Of Distortion

31.8 cm (12.5")

Lock cm (Lock")

Responsiveness

7.7

N/A

Responsiveness Video

SAMPLE

for videos & test results

Response Time

1.0 s

Lock s

Motion Isolation

8.4

N/A

Motion Isolation Video

SAMPLE

for videos & test results

Head/Feet Motion Isolation

Preview Graph

SAMPLE

for pictures & test results

Lumbar Motion Isolation

Preview Graph

SAMPLE

for pictures & test results

Peak Acceleration @ Head/Feet

0.70 g

Lock g

Dissipation Time @ Head/Feet

0.32 s

Lock s

Peak Acceleration @ Lumbar

3.25 g

Lock g

Dissipation Time @ Lumbar

0.32 s

Lock s

Edge Support

6.9

N/A

Naturalistic Loading Pad Video

SAMPLE

for videos & test results

Naturalistic Loading Pad

Preview Graph

SAMPLE

for pictures & test results

Small Platen

Preview Graph

SAMPLE

for pictures & test results

Naturalistic Loading Pad Indentation

156 mm

Lock mm

Small Platen Indentation @ 0 mm From Edge

177 mm

Lock mm

Small Platen Indentation @ 150 mm From Edge

150 mm

Lock mm

Increased Indentation @ Mattress Edge

27 mm

Lock mm

Cooling

7.9

N/A

Cooling Graph

Preview Graph

SAMPLE

for pictures & test results

Energy Transferred Over 1st Hour

63 kJ

Lock kJ

Energy Transferred Over 8 Hours

164 kJ

Lock kJ

Components

Cover

Cover Picture

SAMPLE

for pictures & test results

Sleeping Surface Material

Polyester, Nylon, Polyethylene

Locked

Removable

Locked

Machine Washable

Locked

Edge Construction

Edge Support Picture

SAMPLE

for pictures & test results

Edge Component

None

Locked

Foam Layer Material

Foam Layer Material Picture

SAMPLE

for pictures & test results

Quilted Top Fill

N/A

Upper Comfort Foam @ Head/Feet

Memory Foam

Locked

Upper Comfort Foam @ Lumbar

Memory Foam

Locked

Lower Comfort Foam @ Head/Feet

N/A

Locked

Lower Comfort Foam @ Lumbar

N/A

Locked

Transition Foam

Polyfoam

Locked

Support Foam

Polyfoam

Locked

Foam Layer Mass Density

6.8

N/A

Quilted Top Fill

N/A

Quilted Top Fill Foam Density vs. Reference

N/A

Upper Comfort Foam @ Head/Feet

50 kg/m³ (3.1 lb/cu.ft.)

Lock kg/m³ (Lock lb/cu.ft.)

Upper Comfort Foam @ Head/Feet Density vs. Reference

0.8

Lock

Upper Comfort Foam @ Lumbar

50 kg/m³ (3.1 lb/cu.ft.)

Lock kg/m³ (Lock lb/cu.ft.)

Upper Comfort Foam @ Lumbar Density vs. Reference

0.8

Lock

Lower Comfort Foam @ Head/Feet

N/A

Lock kg/m³ (Lock lb/cu.ft.)

Lower Comfort Foam @ Head/Feet Density vs. Reference

N/A

Lock

Lower Comfort Foam @ Lumbar

N/A

Lock kg/m³ (Lock lb/cu.ft.)

Lower Comfort Foam @ Lumbar Density vs. Reference

N/A

Lock

Transition Foam

35 kg/m³ (2.2 lb/cu.ft.)

Lock kg/m³ (Lock lb/cu.ft.)

Transition Foam Density vs. Reference

1.3

Lock

Support Foam

28 kg/m³ (1.7 lb/cu.ft.)

Lock kg/m³ (Lock lb/cu.ft.)

Support Foam Density vs Reference

0.9

Lock

Foam Layer Thickness

Foam Layer Thickness Picture

SAMPLE

for pictures & test results

Quilted Top

N/A

Upper Comfort Foam @ Head/Feet

7.3 cm (2.9")

Lock cm (Lock")

Upper Comfort Foam @ Lumbar

7.3 cm (2.9")

Lock cm (Lock")

Lower Comfort Foam @ Head/Feet

N/A

Lock cm (Lock")

Lower Comfort Foam @ Lumbar

N/A

Lock cm (Lock")

Transition Foam

7.5 cm (3.0")

Lock cm (Lock")

Support Foam

21.0 cm (8.3")

Lock cm (Lock")

Spring Layer Dimensions

Spring Layer Height Picture

SAMPLE

for pictures & test results

Spring Layer Density Picture

SAMPLE

for pictures & test results

Comfort Layer Height

N/A

Comfort Layer Coil Density

N/A

Comfort Layer Coil Gauge

N/A

Support Layer Height

N/A

Support Layer Coil Density

N/A

Support Layer Coil Gauge @ Head/Feet

N/A

Support Layer Coil Gauge @ Lumbar

N/A

Foam Layer Firmness

Comfort Layer IPD

Preview Graph

SAMPLE

for pictures & test results

Transition & Support Layer IPD

Preview Graph

SAMPLE

for pictures & test results

Quilted Top Fill 25% IPD

N/A

Upper Comfort Foam @ Head/Feet 25% IPD

1.8 kPa

Upper Comfort Foam @ Lumbar 25% IPD

1.8 kPa

Lower Comfort Foam @ Head/Feet 25% IPD

N/A

Lower Comfort Foam @ Lumbar 25% IPD

N/A

Transition Foam 25% IPD

1.9 kPa

Support Foam 25% IPD

3.7 kPa

Spring Layer Firmness

Comfort Layer Firmness

SAMPLE

for pictures & test results

Support Layer Firmness

SAMPLE

for pictures & test results

Spring Layer Firmness

SAMPLE

for videos & test results

Normalized Comfort Layer Stiffness @ Head/Feet

N/A

Normalized Comfort Layer Stiffness @ Lumbar

N/A

Normalized Support Layer Stiffness @ Head/Feet

N/A

Normalized Support Layer Stiffness @ Lumbar

N/A

Foam Layer Resilience

Foam Layer Resilience Video

SAMPLE

for videos & test results

Quilted Top Fill

N/A

Upper Comfort Foam @ Head/Feet

Lock%

Upper Comfort Foam @ Lumbar

Lock%

Lower Comfort Foam @ Head/Feet

N/A

Lock%

Lower Comfort Foam @ Lumbar

N/A

Lock%

Transition Foam

15%

Lock%

Support Foam

46%

Lock%

Spring Layer Bounciness

Comfort Spring Layer Bounciness Video

SAMPLE

for videos & test results

Support Spring Layer Bounciness Video

SAMPLE

for videos & test results

Comfort Spring Layer Maximum Rebound Height

N/A

Support Spring Layer Maximum Rebound Height

N/A

Check Price

California King

CoolNest (14")

Full

CoolNest (14")

King

Serafina Pearl (Plush)

King

CoolNest (14")

Queen

Serafina Pearl (Plush)

Queen

CoolNest (14")

Twin

CoolNest (14")