Products
Saatva Rx
Beautyrest Black
Tested using Methodology v1.0.1
Updated Oct 03, 2025 08:45 PM
SEE PRICE
Saatva
Tested using Methodology v1.0.1
Updated Oct 31, 2025 05:27 PM
SEE PRICE
Beautyrest
Mattress Type
Innerspring
Bounciness Level
Moderate (18 cm)
Sinking Level
High (6 cm)
Firmness Level
Medium (47 Pa/mm)
Contouring Level
Low (32 cm)
Mattress Type
Hybrid
Bounciness Level
Moderate (18 cm)
Sinking Level
Moderate (5 cm)
Firmness Level
Medium (44 Pa/mm)
Contouring Level
Moderate (28 cm)
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
Sleeping (In Development)
Sleeping (In Development)
Threshold
Sleeping (In Development)
7.2
8.0
Edge Support
5.3
8.5
Full Comparison
Design
Style
Style Picture
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
Lumbar Firmness
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)
Bounciness
Bounciness Video
Maximum Rebound Height
18.5 cm (7.3")
18.0 cm (7.1")
Bounciness Level
Moderate (18 cm)
Moderate (18 cm)
Sinking & Contouring
Sinking & Contouring Picture
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")
Sinking Level
High (6 cm)
Moderate (5 cm)
Contouring Level
Low (32 cm)
Moderate (28 cm)
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
Lumbar Motion Isolation
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
Small Platen
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
Energy Transferred Over 1st Hour
55 kJ
57 kJ
Energy Transferred Over 8 Hours
160 kJ
155 kJ
Components
Cover
Cover Picture
Sleeping Surface Material
Organic Cotton
Not Provided by Manufacturer
Removable
No
No
Machine Washable
No
No
Edge Construction
Edge Support Picture
Edge Component
Pocket Coils
Polyfoam
Foam Layer Material
Foam Layer Material Picture
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
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
Spring Layer Density Picture
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
Transition & Support Layer IPD
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
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
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
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Saatva Rx vs Beautyrest Black: Main Discussion
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