Products
Saatva Rx
Beautyrest Black
Tested using Methodology v1.2
Updated Mar 05, 2026 06:56 PM
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Saatva
Tested using Methodology v1.2
Updated Mar 04, 2026 01:12 PM
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Mattress Type
Innerspring
Bed-In-A-Box
No
Upper Comfort Foam @ LumbarMemory Foam
Firmness Level
Medium (47 Pa/mm)
Mattress Type
Hybrid
Bed-In-A-Box
No
Upper Comfort Foam @ LumbarMemory Foam
Firmness Level
Medium (44 Pa/mm)
Our Verdict
Saatva Rx
Beautyrest Black
The Beautyrest Black is a little better than the Saatva Rx. Both mattresses have a medium firmness level and are suitable for most side sleepers. They're moderately bouncy and very responsive, so it's easy to change sleeping positions. The Beautyrest has significantly better edge support, making it more comfortable to sit and sleep on the side of the mattress. It also offers better motion isolation. That said, the Saatva has better cooling. You sink deeper into it, so you might prefer it if you like feeling slightly enveloped by your mattress.
Variants
- Rx (Queen)
- Black (Queen (Series Three/Medium))
Main Differences for
Side Sleeping
Side Sleeping
Threshold
Side Sleeping
7.9
8.0
Full Comparison
Design
Style
Style Picture
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Mattress Type
Innerspring
Hybrid
Bed-In-A-Box
No
No
Quilted Top Layer
Yes
Yes
Grab Handles
Yes
Yes
Thickness
40.1 cm (15.8")
38.5 cm (15.2")
Performance
Firmness
Head/Feet Firmness
Preview Graph
Preview Graph
Lumbar Firmness
Preview Graph
Preview Graph
Firmness Video
Normalized Stiffness @ Head/Feet
44 Pa/mm
46 Pa/mm
Normalized Stiffness @ Lumbar
47 Pa/mm
44 Pa/mm
Firmness Level
Medium (47 Pa/mm)
Medium (44 Pa/mm)
Body Conformity
8.2
8.2
Shoulder Indentation vs. Body Weight
Preview Graph
Preview Graph
Indent @ 50 kg (110 lb)
55 mm (2.2")
56 mm (2.2")
Indent @ 80 kg (176 lb)
80 mm (3.2")
79 mm (3.1")
Indent @ 110 kg (242 lb)
104 mm (4.1")
100 mm (3.9")
Support
7.7
7.0
Pelvis Indentation vs. Body Weight
Preview Graph
Preview Graph
Indent Difference @ 50 kg (110 lb)
8 mm (0.3")
15 mm (0.6")
Indent Difference @ 80 kg (176 lb)
15 mm (0.6")
22 mm (0.9")
Indent Difference @ 110 kg (242 lb)
20 mm (0.8")
28 mm (1.1")
Bounciness
7.8
7.8
Bounciness Video
Maximum Rebound Height
18.5 cm (7.3")
18.0 cm (7.1")
Comfort Layers Envelopment
6.9
7.4
Sinking & Contouring Picture
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Sinking Depth
6.0 cm (2.4")
4.9 cm (1.9")
Diameter Of Distortion
31.6 cm (12.4")
28.0 cm (11.0")
Responsiveness
9.7
8.9
Responsiveness Video
Response Time
0.2 s
0.6 s
Motion Isolation
7.3
7.7
Motion Isolation Video
Head/Feet Motion Isolation
Preview Graph
Preview Graph
Lumbar Motion Isolation
Preview Graph
Preview Graph
Peak Acceleration @ Head/Feet
2.98 g
2.19 g
Dissipation Time @ Head/Feet
0.60 s
0.57 s
Peak Acceleration @ Lumbar
3.55 g
2.53 g
Dissipation Time @ Lumbar
0.46 s
0.62 s
Edge Support
5.3
8.5
Naturalistic Loading Pad Video
Naturalistic Loading Pad
Preview Graph
Preview Graph
Small Platen
Preview Graph
Preview Graph
Naturalistic Loading Pad Indentation
175 mm
139 mm
Small Platen Indentation @ 0 mm From Edge
182 mm
149 mm
Small Platen Indentation @ 150 mm From Edge
139 mm
137 mm
Increased Indentation @ Mattress Edge
43 mm
12 mm
Cooling
7.5
7.4
Cooling Graph
Preview Graph
Preview Graph
Energy Transferred Over 1st Hour
55 kJ
57 kJ
Energy Transferred Over 8 Hours
160 kJ
155 kJ
Components
Cover
Cover Picture
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Sleeping Surface Material
Organic Cotton
Not Provided by Manufacturer
Removable
No
No
Machine Washable
No
No
Edge Construction
Edge Support Picture
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Edge Component
Pocket Coils
Polyfoam
Foam Layer Material
Foam Layer Material Picture
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Quilted Top Fill
Polyfoam + Fiber Fill
Polyfoam + Fiber Fill
Upper Comfort Foam @ Head/Feet
N/A
Memory Foam
Upper Comfort Foam @ Lumbar
Memory Foam
Memory Foam
Lower Comfort Foam @ Head/Feet
Polyfoam
Latex
Lower Comfort Foam @ Lumbar
Polyfoam
Latex
Transition Foam
Polyfoam
Polyfoam
Support Foam
N/A
N/A
Foam Layer Mass Density
5.0
6.8
Quilted Top Fill
23 kg/m³ (1.4 lb/cu.ft.)
24 kg/m³ (1.5 lb/cu.ft.)
Quilted Top Fill Foam Density vs. Reference
0.6
0.6
Upper Comfort Foam @ Head/Feet
N/A
47 kg/m³ (3.0 lb/cu.ft.)
Upper Comfort Foam @ Head/Feet Density vs. Reference
N/A
0.7
Upper Comfort Foam @ Lumbar
42 kg/m³ (2.6 lb/cu.ft.)
47 kg/m³ (2.9 lb/cu.ft.)
Upper Comfort Foam @ Lumbar Density vs. Reference
0.7
0.7
Lower Comfort Foam @ Head/Feet
24 kg/m³ (1.5 lb/cu.ft.)
83 kg/m³ (5.2 lb/cu.ft.)
Lower Comfort Foam @ Head/Feet Density vs. Reference
0.6
1.8
Lower Comfort Foam @ Lumbar
24 kg/m³ (1.5 lb/cu.ft.)
83 kg/m³ (5.2 lb/cu.ft.)
Lower Comfort Foam @ Lumbar Density vs. Reference
0.6
1.8
Transition Foam
23 kg/m³ (1.4 lb/cu.ft.)
29 kg/m³ (1.8 lb/cu.ft.)
Transition Foam Density vs. Reference
0.6
0.9
Support Foam
N/A
N/A
Support Foam Density vs Reference
N/A
N/A
Foam Layer Thickness
Foam Layer Thickness Picture
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Quilted Top
5.0 cm (2.0")
8.0 cm (3.1")
Upper Comfort Foam @ Head/Feet
N/A
1.3 cm (0.5")
Upper Comfort Foam @ Lumbar
1.0 cm (0.4")
1.3 cm (0.5")
Lower Comfort Foam @ Head/Feet
1.9 cm (0.7")
4.0 cm (1.6")
Lower Comfort Foam @ Lumbar
1.9 cm (0.7")
4.0 cm (1.6")
Transition Foam
1.9 cm (0.7")
3.8 cm (1.5")
Support Foam
N/A
N/A
Spring Layer Dimensions
Spring Layer Height Picture
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Spring Layer Density Picture
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Comfort Layer Height
3.0 cm (1.2")
N/A
Comfort Layer Coil Density
629 coils/m² (58 coils/ft²)
N/A
Comfort Layer Coil Gauge
18 gauge
N/A
Support Layer Height
25.3 cm (10.0")
21.0 cm (8.3")
Support Layer Coil Density
181 coils/m² (17 coils/ft²)
268 coils/m² (25 coils/ft²)
Support Layer Coil Gauge @ Head/Feet
14 gauge
12 gauge
Support Layer Coil Gauge @ Lumbar
14 gauge
12 gauge
Foam Layer Firmness
Comfort Layer IPD
Preview Graph
Preview Graph
Transition & Support Layer IPD
Preview Graph
Preview Graph
Quilted Top Fill 25% IPD
1.4 kPa
1.4 kPa
Upper Comfort Foam @ Head/Feet 25% IPD
N/A
1.5 kPa
Upper Comfort Foam @ Lumbar 25% IPD
2.1 kPa
1.5 kPa
Lower Comfort Foam @ Head/Feet 25% IPD
2.6 kPa
2.8 kPa
Lower Comfort Foam @ Lumbar 25% IPD
2.6 kPa
2.8 kPa
Transition Foam 25% IPD
2.7 kPa
3.1 kPa
Support Foam 25% IPD
N/A
N/A
Spring Layer Firmness
Comfort Layer Firmness
Preview Graph
Support Layer Firmness
Preview Graph
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
43 Pa/mm
69 Pa/mm
Normalized Support Layer Stiffness @ Lumbar
45 Pa/mm
69 Pa/mm
Foam Layer Resilience
Foam Layer Resilience Video
Quilted Top Fill
40%
30%
Upper Comfort Foam @ Head/Feet
N/A
2%
Upper Comfort Foam @ Lumbar
20%
2%
Lower Comfort Foam @ Head/Feet
53%
58%
Lower Comfort Foam @ Lumbar
53%
58%
Transition Foam
52%
48%
Support Foam
N/A
N/A
Spring Layer Bounciness
Comfort Spring Layer Bounciness Video
Support Spring Layer Bounciness Video
Comfort Spring Layer Maximum Rebound Height
30.5 cm (12.0")
N/A
Support Spring Layer Maximum Rebound Height
21.0 cm (8.3")
53.0 cm (20.9")
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Saatva Rx
Beautyrest Black
Comments
Saatva Rx vs Beautyrest Black: Main Discussion
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