Products
Tested using Methodology v1.2
Updated Mar 27, 2026 06:34 PM
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Tested using Methodology v1.2
Updated Mar 05, 2026 06:05 PM
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Helix
Mattress Type
Foam
Bed-In-A-Box
Yes
Upper Comfort Foam @ LumbarPolyfoam
Firmness Level
Medium (42 Pa/mm)
Mattress Type
Hybrid
Bed-In-A-Box
Yes
Upper Comfort Foam @ LumbarMemory Foam
Firmness Level
Medium (44 Pa/mm)
Our Verdict
Casper Cooling Select
Helix Midnight Luxe 2025
The Helix Midnight Luxe 2025 and the Casper Cooling Select offer different benefits, and you may prefer either depending on your priorities. The Helix is a medium hybrid mattress that offers slightly better cooling, so it's a better choice if you sleep hot. It's also bouncier and more responsive, so it's easier to move around on. The Casper is a medium all-foam mattress with better motion isolation, so you may prefer it if you sleep with a partner who tosses and turns throughout the night.
Variants
- Cooling Select (Queen)
- Midnight Luxe 2025 (Queen)
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Queen
Cooling Select
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Queen
Midnight Luxe 2025
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Helix
Main Differences for
Side Sleeping
Side Sleeping
Threshold
Side Sleeping
7.4
8.2
Full Comparison
Design
Style
Style Picture
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Mattress Type
Foam
Hybrid
Bed-In-A-Box
Yes
Yes
Quilted Top Layer
No
Yes
Grab Handles
No
Yes
Thickness
30.0 cm (11.8")
34.8 cm (13.7")
Performance
Firmness
Head/Feet Firmness
Preview Graph
Preview Graph
Lumbar Firmness
Preview Graph
Preview Graph
Firmness Video
Normalized Stiffness @ Head/Feet
38 Pa/mm
41 Pa/mm
Normalized Stiffness @ Lumbar
42 Pa/mm
44 Pa/mm
Firmness Level
Medium (42 Pa/mm)
Medium (44 Pa/mm)
Body Conformity
7.5
8.3
Shoulder Indentation vs. Body Weight
Preview Graph
Preview Graph
Indent @ 50 kg (110 lb)
44 mm (1.7")
55 mm (2.2")
Indent @ 80 kg (176 lb)
72 mm (2.8")
83 mm (3.3")
Indent @ 110 kg (242 lb)
90 mm (3.5")
105 mm (4.1")
Support
7.5
7.2
Pelvis Indentation vs. Body Weight
Preview Graph
Preview Graph
Indent Difference @ 50 kg (110 lb)
16 mm (0.6")
18 mm (0.7")
Indent Difference @ 80 kg (176 lb)
19 mm (0.7")
22 mm (0.9")
Indent Difference @ 110 kg (242 lb)
16 mm (0.6")
22 mm (0.9")
Bounciness
6.3
7.4
Bounciness Video
Maximum Rebound Height
9.0 cm (3.5")
15.0 cm (5.9")
Comfort Layers Envelopment
6.6
8.0
Sinking & Contouring Picture
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Sinking Depth
4.2 cm (1.6")
5.3 cm (2.1")
Diameter Of Distortion
27.4 cm (10.8")
27.0 cm (10.6")
Responsiveness
8.8
8.4
Responsiveness Video
Response Time
0.6 s
0.7 s
Motion Isolation
8.6
8.2
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
0.88 g
Dissipation Time @ Head/Feet
0.20 s
0.53 s
Peak Acceleration @ Lumbar
3.42 g
1.94 g
Dissipation Time @ Lumbar
0.19 s
0.61 s
Edge Support
7.7
9.0
Naturalistic Loading Pad Video
Naturalistic Loading Pad
Preview Graph
Preview Graph
Small Platen
Preview Graph
Preview Graph
Naturalistic Loading Pad Indentation
143 mm
134 mm
Small Platen Indentation @ 0 mm From Edge
170 mm
147 mm
Small Platen Indentation @ 150 mm From Edge
147 mm
150 mm
Increased Indentation @ Mattress Edge
23 mm
-3 mm
Cooling
7.9
8.2
Cooling Graph
Preview Graph
Preview Graph
Energy Transferred Over 1st Hour
63 kJ
63 kJ
Energy Transferred Over 8 Hours
165 kJ
176 kJ
Components
Cover
Cover Picture
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Sleeping Surface Material
Polyester, Polyethylene, Spandex
TENCEL
Removable
No
No
Machine Washable
No
No
Edge Construction
Edge Support Picture
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Edge Component
Pocket Coils
Foam Layer Material
Foam Layer Material Picture
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Quilted Top Fill
N/A
Memory Foam + Polyfoam + Fiber Fill
Upper Comfort Foam @ Head/Feet
Polyfoam
Memory Foam
Upper Comfort Foam @ Lumbar
Polyfoam
Memory Foam
Lower Comfort Foam @ Head/Feet
Memory Foam
N/A
Lower Comfort Foam @ Lumbar
Memory Foam
N/A
Transition Foam
Polyfoam
Polyfoam
Support Foam
Polyfoam
N/A
Foam Layer Mass Density
6.7
6.8
Quilted Top Fill
N/A
25 kg/m³ (1.6 lb/cu.ft.)
Quilted Top Fill Foam Density vs. Reference
N/A
0.7
Upper Comfort Foam @ Head/Feet
43 kg/m³ (2.7 lb/cu.ft.)
68 kg/m³ (4.2 lb/cu.ft.)
Upper Comfort Foam @ Head/Feet Density vs. Reference
1.8
1.1
Upper Comfort Foam @ Lumbar
43 kg/m³ (2.7 lb/cu.ft.)
68 kg/m³ (4.2 lb/cu.ft.)
Upper Comfort Foam @ Lumbar Density vs. Reference
1.8
1.1
Lower Comfort Foam @ Head/Feet
41 kg/m³ (2.5 lb/cu.ft.)
N/A
Lower Comfort Foam @ Head/Feet Density vs. Reference
0.6
N/A
Lower Comfort Foam @ Lumbar
41 kg/m³ (2.6 lb/cu.ft.)
N/A
Lower Comfort Foam @ Lumbar Density vs. Reference
0.6
N/A
Transition Foam
28 kg/m³ (1.7 lb/cu.ft.)
30 kg/m³ (1.8 lb/cu.ft.)
Transition Foam Density vs. Reference
0.9
1.0
Support Foam
29 kg/m³ (1.8 lb/cu.ft.)
N/A
Support Foam Density vs Reference
0.9
N/A
Foam Layer Thickness
Foam Layer Thickness Picture
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Quilted Top
N/A
5.0 cm (2.0")
Upper Comfort Foam @ Head/Feet
3.8 cm (1.5")
5.1 cm (2.0")
Upper Comfort Foam @ Lumbar
3.8 cm (1.5")
5.1 cm (2.0")
Lower Comfort Foam @ Head/Feet
3.8 cm (1.5")
N/A
Lower Comfort Foam @ Lumbar
3.8 cm (1.5")
N/A
Transition Foam
3.5 cm (1.4")
2.5 cm (1.0")
Support Foam
19.0 cm (7.5")
N/A
Spring Layer Dimensions
Spring Layer Height Picture
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Spring Layer Density Picture
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Compare High-Res
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
20.5 cm (8.1")
Support Layer Coil Density
N/A
248 coils/m² (23 coils/ft²)
Support Layer Coil Gauge @ Head/Feet
N/A
14 gauge
Support Layer Coil Gauge @ Lumbar
N/A
13 gauge
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
1.4 kPa
Upper Comfort Foam @ Head/Feet 25% IPD
2.6 kPa
2.2 kPa
Upper Comfort Foam @ Lumbar 25% IPD
2.6 kPa
2.2 kPa
Lower Comfort Foam @ Head/Feet 25% IPD
2.0 kPa
N/A
Lower Comfort Foam @ Lumbar 25% IPD
2.0 kPa
N/A
Transition Foam 25% IPD
1.4 kPa
4.3 kPa
Support Foam 25% IPD
4.0 kPa
N/A
Spring Layer Firmness
Comfort Layer Firmness
Support Layer Firmness
Preview Graph
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
81 Pa/mm
Normalized Support Layer Stiffness @ Lumbar
N/A
54 Pa/mm
Foam Layer Resilience
Foam Layer Resilience Video
Quilted Top Fill
N/A
45%
Upper Comfort Foam @ Head/Feet
23%
2%
Upper Comfort Foam @ Lumbar
23%
2%
Lower Comfort Foam @ Head/Feet
4%
N/A
Lower Comfort Foam @ Lumbar
4%
N/A
Transition Foam
43%
47%
Support Foam
45%
N/A
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
46.0 cm (18.1")
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Queen
Cooling Select
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Queen
Midnight Luxe 2025
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Helix
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Casper Cooling Select
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Casper Cooling Select vs Helix Midnight Luxe 2025: Main Discussion
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