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Tested using Methodology v1.2
Updated Aug 27, 2026 01:05 PM
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Tested using Methodology v1.2
Updated Aug 14, 2026 06:31 PM
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Mattress Type
Foam
Bed-In-A-Box
Yes
Upper Comfort Foam @ LumbarPolyfoam
Firmness Level
Medium (42 Pa/mm)
Mattress Type
Foam
Bed-In-A-Box
Yes
Upper Comfort Foam @ LumbarMemory Foam
Firmness Level
Medium-Plush (40 Pa/mm)
Our Verdict
Casper Cooling Select
SweetNight CoolNest Pro
The Casper Cooling Select and the SweetNight CoolNest Pro are both good options, but they have different strengths. The Casper is more supportive, making it a better choice for back and stomach sleepers, while the SweetNight provides more pressure relief, making it a better choice for side sleepers. They're pretty evenly matched in terms of motion dissipation and responsiveness, so they're both easy to move around on, and either is a good option if you're looking to sleep peacefully with a partner. However, the Casper is more durable, while the SweetNight offers better cooling.
Variants
- Cooling Select (Queen)
- CoolNest Pro (14") (King)
- CoolNest Pro (14") (Queen)
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King
CoolNest Pro (14")
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Queen
Cooling Select
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Queen
CoolNest Pro (14")
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Main Differences for
Side Sleeping
Side Sleeping
Threshold
Side Sleeping
7.4
7.7
Full Comparison
Design
Style
Style Picture
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Mattress Type
Foam
Foam
Bed-In-A-Box
Yes
Yes
Quilted Top Layer
No
No
Grab Handles
No
No
Thickness
30.0 cm (11.8")
34.2 cm (13.5")
Performance
Firmness
Head/Feet Firmness
Preview Graph
Preview Graph
Lumbar Firmness
Preview Graph
Preview Graph
Firmness Video
Normalized Stiffness @ Head/Feet
38 Pa/mm
38 Pa/mm
Normalized Stiffness @ Lumbar
42 Pa/mm
40 Pa/mm
Firmness Level
Medium (42 Pa/mm)
Medium-Plush (40 Pa/mm)
Body Conformity
7.5
7.8
Shoulder Indentation vs. Body Weight
Preview Graph
Preview Graph
Body Conformity Picture 1
Body Conformity Picture 2
Indent @ 50 kg (110 lb)
44 mm (1.7")
47 mm (1.8")
Indent @ 80 kg (176 lb)
72 mm (2.8")
74 mm (2.9")
Indent @ 110 kg (242 lb)
90 mm (3.5")
101 mm (4.0")
Support
7.5
6.7
Pelvis Indentation vs. Body Weight
Preview Graph
Preview Graph
Indent Difference @ 50 kg (110 lb)
16 mm (0.6")
19 mm (0.7")
Indent Difference @ 80 kg (176 lb)
19 mm (0.7")
23 mm (0.9")
Indent Difference @ 110 kg (242 lb)
16 mm (0.6")
30 mm (1.2")
Bounciness
6.3
6.7
Bounciness Video
Maximum Rebound Height
9.0 cm (3.5")
11.0 cm (4.3")
Comfort Layers Envelopment
6.6
7.7
Sinking & Contouring Picture
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Sinking Depth
4.2 cm (1.6")
4.8 cm (1.9")
Diameter Of Distortion
27.4 cm (10.8")
26.9 cm (10.6")
Responsiveness
8.8
9.0
Responsiveness Video
Response Time
0.6 s
0.6 s
Motion Isolation
8.6
8.7
Motion Isolation Video
Head/Feet Motion Isolation
Preview Graph
Preview Graph
Lumbar Motion Isolation
Preview Graph
Preview Graph
Peak Acceleration @ Head/Feet
0.34 g
0.47 g
Dissipation Time @ Head/Feet
0.20 s
0.33 s
Peak Acceleration @ Lumbar
3.42 g
2.57 g
Dissipation Time @ Lumbar
0.19 s
0.34 s
Edge Support
7.7
5.1
Naturalistic Loading Pad Video
Naturalistic Loading Pad
Preview Graph
Preview Graph
Small Platen
Preview Graph
Preview Graph
Naturalistic Loading Pad Indentation
143 mm
182 mm
Small Platen Indentation @ 0 mm From Edge
170 mm
201 mm
Small Platen Indentation @ 150 mm From Edge
147 mm
155 mm
Increased Indentation @ Mattress Edge
23 mm
46 mm
Cooling
7.9
8.7
Cooling Graph
Preview Graph
Preview Graph
Energy Transferred Over 1st Hour
63 kJ
73 kJ
Energy Transferred Over 8 Hours
165 kJ
186 kJ
Components
Cover
Cover Picture
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Sleeping Surface Material
Polyester, Polyethylene, Spandex
Polyester
Removable
No
Yes
Machine Washable
No
No
Edge Construction
Edge Support Picture
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Edge Component
None
Foam Layer Material
Foam Layer Material Picture
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Quilted Top Fill
N/A
N/A
Upper Comfort Foam @ Head/Feet
Polyfoam
Memory Foam
Upper Comfort Foam @ Lumbar
Polyfoam
Memory Foam
Lower Comfort Foam @ Head/Feet
Memory Foam
Memory Foam
Lower Comfort Foam @ Lumbar
Memory Foam
Memory Foam
Transition Foam
Polyfoam
Polyfoam
Support Foam
Polyfoam
Polyfoam
Foam Layer Mass Density
6.7
6.1
Quilted Top Fill
N/A
N/A
Quilted Top Fill Foam Density vs. Reference
N/A
N/A
Upper Comfort Foam @ Head/Feet
43 kg/m³ (2.7 lb/cu.ft.)
52 kg/m³ (3.2 lb/cu.ft.)
Upper Comfort Foam @ Head/Feet Density vs. Reference
1.8
0.8
Upper Comfort Foam @ Lumbar
43 kg/m³ (2.7 lb/cu.ft.)
52 kg/m³ (3.2 lb/cu.ft.)
Upper Comfort Foam @ Lumbar Density vs. Reference
1.8
0.8
Lower Comfort Foam @ Head/Feet
41 kg/m³ (2.5 lb/cu.ft.)
32 kg/m³ (2.0 lb/cu.ft.)
Lower Comfort Foam @ Head/Feet Density vs. Reference
0.6
0.5
Lower Comfort Foam @ Lumbar
41 kg/m³ (2.6 lb/cu.ft.)
32 kg/m³ (2.0 lb/cu.ft.)
Lower Comfort Foam @ Lumbar Density vs. Reference
0.6
0.5
Transition Foam
28 kg/m³ (1.7 lb/cu.ft.)
29 kg/m³ (1.8 lb/cu.ft.)
Transition Foam Density vs. Reference
0.9
0.9
Support Foam
29 kg/m³ (1.8 lb/cu.ft.)
28 kg/m³ (1.7 lb/cu.ft.)
Support Foam Density vs Reference
0.9
0.8
Foam Layer Thickness
Foam Layer Thickness Picture
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Quilted Top
N/A
N/A
Upper Comfort Foam @ Head/Feet
3.8 cm (1.5")
2.5 cm (1.0")
Upper Comfort Foam @ Lumbar
3.8 cm (1.5")
2.5 cm (1.0")
Lower Comfort Foam @ Head/Feet
3.8 cm (1.5")
5.0 cm (2.0")
Lower Comfort Foam @ Lumbar
3.8 cm (1.5")
5.0 cm (2.0")
Transition Foam
3.5 cm (1.4")
9.5 cm (3.7")
Support Foam
19.0 cm (7.5")
10.5 cm (4.1")
Spring Layer Dimensions
Spring Layer Height Picture
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Spring Layer Density Picture
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Comfort Layer Height
N/A
N/A
Comfort Layer Coil Density
N/A
N/A
Comfort Layer Coil Gauge
N/A
N/A
Support Layer Height
N/A
N/A
Support Layer Coil Density
N/A
N/A
Support Layer Coil Gauge @ Head/Feet
N/A
N/A
Support Layer Coil Gauge @ Lumbar
N/A
N/A
Foam Layer Firmness
Comfort Layer IPD
Preview Graph
Preview Graph
Transition & Support Layer IPD
Preview Graph
Preview Graph
Quilted Top Fill 25% IPD
N/A
N/A
Upper Comfort Foam @ Head/Feet 25% IPD
2.6 kPa
1.7 kPa
Upper Comfort Foam @ Lumbar 25% IPD
2.6 kPa
1.7 kPa
Lower Comfort Foam @ Head/Feet 25% IPD
2.0 kPa
1.7 kPa
Lower Comfort Foam @ Lumbar 25% IPD
2.0 kPa
1.7 kPa
Transition Foam 25% IPD
1.4 kPa
2.6 kPa
Support Foam 25% IPD
4.0 kPa
3.3 kPa
Spring Layer Firmness
Comfort Layer Firmness
Support Layer Firmness
Spring Layer Firmness
Normalized Comfort Layer Stiffness @ Head/Feet
N/A
N/A
Normalized Comfort Layer Stiffness @ Lumbar
N/A
N/A
Normalized Support Layer Stiffness @ Head/Feet
N/A
N/A
Normalized Support Layer Stiffness @ Lumbar
N/A
N/A
Foam Layer Resilience
Foam Layer Resilience Video
Quilted Top Fill
N/A
N/A
Upper Comfort Foam @ Head/Feet
23%
20%
Upper Comfort Foam @ Lumbar
23%
20%
Lower Comfort Foam @ Head/Feet
4%
4%
Lower Comfort Foam @ Lumbar
4%
4%
Transition Foam
43%
49%
Support Foam
45%
39%
Spring Layer Bounciness
Comfort Spring Layer Bounciness Video
Support Spring Layer Bounciness Video
Comfort Spring Layer Maximum Rebound Height
N/A
N/A
Support Spring Layer Maximum Rebound Height
N/A
N/A
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King
CoolNest Pro (14")
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Queen
Cooling Select
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Queen
CoolNest Pro (14")
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Casper Cooling Select
SweetNight CoolNest Pro
Comments
Casper Cooling Select vs SweetNight CoolNest Pro: Main Discussion
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