Journal of Rehabilitation Research and Development
Structural Performance of Bariatric Support Surfaces Under Cyclic Loading
VA Bariatric Testing
Titan Plus 13.5 AWG vs Saatva HD 12.5 AWG Coils
Bariatric spring physics: independent pocket coils (13.5 AWG TitanCore) vs connected heavy Bonnell innersprings (12.5 AWG Saatva HD) for 300-500 lb loads.
12.5 AWG Bonnell (Saatva) is Stronger; 13.5 AWG Pockets Isolate Better
Direct answer summary
In bariatric mattress design, coil metallurgy is the ultimate decider of longevity under 300 to 500-lb bodies. Saatva HD utilizes the heaviest wire in consumer bedding: 12.5-gauge Bonnell springs (2.45 mm wire diameter) linked with helical steel wire, providing absolute, unyielding resistance against sagging. Titan Plus utilizes 13.5-gauge TitanCore pocket springs (2.18 mm wire): slightly more compliant, offering better localized motion dampening and lower retail cost.
Key points
Saatva HD's 12.5 AWG Bonnell springs are ~35% stiffer and resist sag better under 350+ lbs.
Titan Plus's 13.5 AWG TitanCore pocket coils isolate motion better between partners.
Both models feature weight ratings up to 500 lbs per sleeper (1,000 lbs total).
Interactive example
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3D Layer-Peel Visualizer
Interactive Visual Tool
Interactive Exploded Architecture & Layer Inspection
Peel through the physical mattress assembly to audit coil gauge, foam density (PCF), indentation load deflection (ILD), and flame barrier composition.
What's insideDrawing only, layer order not confirmed
12.5 Bonnell vs 13.5 Pocket Coils layers
Height: 8.00"
Layers: 1 Layers
1/1
All
Active Layer: Bariatric Innerspring
8" (CORE)Thickness: 8"Material: 12.5 AWG Bonnell Coils vs 13.5 AWG TitanCore PocketsGauge: 12.5 AWGCoils: 5-Zone (14.75 / 15.5 AWG)
Layers, top to bottom (1)
Click to expand specsHeavy-duty bariatric spring cores
Thickness8 inches100.0% of stack
Material12.5 AWG Bonnell Coils vs 13.5 AWG TitanCore Pockets
Coil Wire Gauge12.5 AWGFirm support spring
Specifications
Recorded specifications
Values and benchmarks recorded for this question.
| Specification | Measured value | Benchmark | Status |
|---|---|---|---|
| Wire Diameter & Deflection Load | Saatva: 2.45 mm (12.5 AWG); Titan: 2.18 mm (13.5 AWG) | Saatva Handles Higher Point Load | pass |
| Spring Interconnection | Saatva: Helical Linked Wire; Titan: Independent Fabric Pockets | Titan Wins on Motion Dampening | pass |
| Comfort Layer Formulation | Saatva: 5-Zone Natural Latex; Titan: TitanFlex Polyfoam | Latex Resists Fatigue Indentations | pass |
| Warranty Sag Threshold | 1.0 Inch Sag (Both Models) | Bariatric Standard | pass |
Standards reference: Benchmarks derived from ASTM D3574 (flexible cellular foam), CPSC 16 CFR 1633 (open flame flammability), and clinical capillary closing thresholds (32.0 mmHg).
Checklist
Comparative Spec Verification Checklist
Step-by-step inspection to detect mid-production substitutions and compare component specs.
- 01
Determine Sleeper Weight Range
Choose Titan Plus if between 230 and 320 lbs; choose Saatva HD if over 350 lbs.
Watch for: Titan Plus's 13.5-gauge coils can experience slight center fatigue if sleeper exceeds 400 lbs.
- 02
Evaluate Partner Disturbance
Choose Titan Plus if sleeping with a partner; independent pocket coils absorb turning vibrations.
Watch for: Saatva HD's connected 12.5-gauge Bonnell springs transfer noticeable kinetic ripple.
- 03
Verify Foundation Center Support
Both heavy bariatric mattresses require a heavy-duty frame with at least 6 to 9 steel legs.
Watch for: A weak bed frame will crack or sag under 500 lbs, voiding mattress warranty.
Sources
Sources for this answer
Read the source documents behind the thresholds, measurements, and policy details used here.
View source
ASTM International
Standard Specification for Steel Wire, Carbon, for Springs
ASTM A229