Why choose S/Lab Genesis?Buy S/Lab Genesis if
+2.1 Stability & Support+2.1 Stability & Support: Better measured rating in wear-test consensus.
Head-to-Head Comparison·Lab Telemetry
Salomon · Trail
WINNER
S/Lab Genesis
83
Stack34mm
Weight258g
Drop8mm
Salomon · Trail
Ultra Glide 4
80
Stack41mm
Weight284g
Drop6mm
Key Differences & Advantages
Why choose Ultra Glide 4?Buy Ultra Glide 4 if
+2.0 Cushioning & Softness+2.0 Underfoot Rebound: Snappier propulsion and mechanical return through toe-off.
The Runner's Pick
Final Decision: Who Buys Which Model?
Side-by-side selection criteria grounded in verified mechanical specs
Salomon
S/Lab Genesis
83
Choose the S/Lab Genesis if:
Choose the S/Lab Genesis if your priority is a secure, planted base with confident guidance powered by EnergyFoam and a noticeably lighter weight (258g vs 284g). It is the better match for runners targeting neutral support and surefooted stride containment over the Ultra Glide 4's focus on high-mileage protection and low-impact recovery cruising.
8mm drop · 258g · $200Audit
Salomon
Ultra Glide 4
80
Choose the Ultra Glide 4 if:
Choose the Ultra Glide 4 if your priority is plush impact absorption and deep underfoot comfort powered by optiFOAM supercritical EVA/TPE blend midsole (284g). It is the better match for runners targeting high-mileage protection and low-impact recovery cruising over the S/Lab Genesis's focus on minimizing leg fatigue across late-mile splits.
6mm drop · 284g · $160Audit
Dealbreaker Warnings · Who Should Skip These
Critical biomechanical trade-offs to avoid buying the wrong shoe
Salomon S/Lab Genesis
Skip S/Lab Genesis if your mileage includes paved asphalt or concrete; aggressive 4.5mm lugs wear rapidly on hard surfaces and cause harsh ground shock.
Salomon Ultra Glide 4
Skip Ultra Glide 4 if your mileage includes paved asphalt or concrete; aggressive 4mm lugs wear rapidly on hard surfaces and cause harsh ground shock.
8-Axis Telemetry Radar
S/Lab Genesis leads by +3.0 PTS
S/Lab83vsUltra80
Tap any axis node to inspect wear-test citations
🔬 Inspect Granular Lab Specs & Fit Telemetry▼
Fit & Sizing Consensus
Real-world wear-test consensus across runner foot profiles
S/Lab Genesis
Ultra Glide 4
Sizing LengthMatch
Runs Small
True to Size
S/Lab80%Ultra81%
Runs Large
S/Lab Genesis: True to size(n=28)
Ultra Glide 4: True to size(n=30)
Toe Box WidthSizing differs
Performance Tight
Ultra64%
Standard
S/Lab74%
Wide
S/Lab Genesis: Standard width(n=26)
Ultra Glide 4: Performance tight / narrow(n=25)
Arch SupportMatch
Flat / Low
Neutral Stability
S/Lab70%Ultra77%
High Arch
S/Lab Genesis: Neutral stability / moderate arch(n=18)
Ultra Glide 4: Neutral stability / moderate arch(n=22)
| RADAR AXIS | S/Lab Genesis | Ultra Glide 4 | Δ DELTA | COHORT RANK |
|---|---|---|---|---|
| Cushioning & Softness | 7.2 | 9.2 | −2.0 (Ultra Glide 4 higher by NaN) | #1/28 |
| Energy Return & Bounce | 6.6 | 6.8 | −0.2 (Ultra Glide 4 higher by NaN) | #1/28 |
| Weight Efficiency | 8.9 | 7.4 | +1.5 (S/Lab Genesis higher by 1.5) | #1/28 |
| Stability & Support | 9.1 | 7.0 | +2.1 (S/Lab Genesis higher by 2.1) | #1/28 |
| Traction & Grip | 8.9 | 8.4 | +0.5 (S/Lab Genesis higher by 0.5) | #1/28 |
| Upper Comfort & Lockdown | 8.1 | 8.6 | −0.5 (Ultra Glide 4 higher by NaN) | #1/28 |
| Breathability | 7.4 | 8.2 | −0.8 (Ultra Glide 4 higher by NaN) | #1/28 |
| Durability | 8.6 | 7.9 | +0.7 (S/Lab Genesis higher by 0.7) | #1/28 |
| Meta-Score | 83strong | 80contender | +3.0 | Calibrated |
The Record · Specification Telemetry
Cohort-relative percentiles and verified technical specs
S/Lab Genesis
Ultra Glide 4
Weight (US Men's 9)Lighter than 78% of daily trainers
S/Lab Genesis258g
Ultra Glide 4284g
›Salomon S/Lab Genesis saves 26g per stride, noticeable after mile 6 of continuous running.
Heel Cushion StackMore underfoot foam than 62% of trainers
S/Lab Genesis34.0mm
Ultra Glide 441.0mm
›Salomon Ultra Glide 4 delivers 7.0mm more vibration isolation for long recovery efforts than S/Lab Genesis.
Heel-to-Toe DropΔ 2.0mm
S/Lab Genesis8.0mm
Ultra Glide 46.0mm
›S/Lab Genesis's 8mm drop shifts load toward the knees/quads, while Ultra Glide 4's 6mm drop engages the Achilles and calves.
Midsole Foam & Energy ReturnHigher rebound than 69% of tested foams
EnergyFoam6.6/10
optiFOAM supercritical EVA/TPE blend midsole6.8/10
›optiFOAM supercritical EVA/TPE blend midsole yields a springier, high-rebound toe-off compared to EnergyFoam's grounded, stable feel.
Outsole Durability & TractionTougher rubber than 90% of road shoes
All-purpose Contragrip8.6/10
All-Terrain Contagrip with 4mm lugs7.9/10
›S/Lab Genesis utilizes All-purpose Contragrip compound formulated for extended 500+ mile abrasive asphalt longevity.
Fit & Sizing Consensus
Real-world wear-test consensus across runner foot profiles
S/Lab Genesis
Ultra Glide 4
Sizing LengthMatch
Runs Small
True to Size
S/Lab80%Ultra81%
Runs Large
S/Lab Genesis: True to size(n=28)
Ultra Glide 4: True to size(n=30)
Toe Box WidthSizing differs
Performance Tight
Ultra64%
Standard
S/Lab74%
Wide
S/Lab Genesis: Standard width(n=26)
Ultra Glide 4: Performance tight / narrow(n=25)
Arch SupportMatch
Flat / Low
Neutral Stability
S/Lab70%Ultra77%
High Arch
S/Lab Genesis: Neutral stability / moderate arch(n=18)
Ultra Glide 4: Neutral stability / moderate arch(n=22)
The Record · Specification Telemetry
Cohort-relative percentiles and verified technical specs
S/Lab Genesis
Ultra Glide 4
Weight (US Men's 9)Lighter than 78% of daily trainers
S/Lab Genesis258g
Ultra Glide 4284g
›Salomon S/Lab Genesis saves 26g per stride, noticeable after mile 6 of continuous running.
Heel Cushion StackMore underfoot foam than 62% of trainers
S/Lab Genesis34.0mm
Ultra Glide 441.0mm
›Salomon Ultra Glide 4 delivers 7.0mm more vibration isolation for long recovery efforts than S/Lab Genesis.
Heel-to-Toe DropΔ 2.0mm
S/Lab Genesis8.0mm
Ultra Glide 46.0mm
›S/Lab Genesis's 8mm drop shifts load toward the knees/quads, while Ultra Glide 4's 6mm drop engages the Achilles and calves.
Midsole Foam & Energy ReturnHigher rebound than 69% of tested foams
EnergyFoam6.6/10
optiFOAM supercritical EVA/TPE blend midsole6.8/10
›optiFOAM supercritical EVA/TPE blend midsole yields a springier, high-rebound toe-off compared to EnergyFoam's grounded, stable feel.
Outsole Durability & TractionTougher rubber than 90% of road shoes
All-purpose Contragrip8.6/10
All-Terrain Contagrip with 4mm lugs7.9/10
›S/Lab Genesis utilizes All-purpose Contragrip compound formulated for extended 500+ mile abrasive asphalt longevity.
| RADAR AXIS | S/Lab Genesis | Ultra Glide 4 | Δ DELTA | COHORT RANK |
|---|---|---|---|---|
| Cushioning & Softness | 7.2 | 9.2 | −2.0 (Ultra Glide 4 higher by NaN) | #1/28 |
| Energy Return & Bounce | 6.6 | 6.8 | −0.2 (Ultra Glide 4 higher by NaN) | #1/28 |
| Weight Efficiency | 8.9 | 7.4 | +1.5 (S/Lab Genesis higher by 1.5) | #1/28 |
| Stability & Support | 9.1 | 7.0 | +2.1 (S/Lab Genesis higher by 2.1) | #1/28 |
| Traction & Grip | 8.9 | 8.4 | +0.5 (S/Lab Genesis higher by 0.5) | #1/28 |
| Upper Comfort & Lockdown | 8.1 | 8.6 | −0.5 (Ultra Glide 4 higher by NaN) | #1/28 |
| Breathability | 7.4 | 8.2 | −0.8 (Ultra Glide 4 higher by NaN) | #1/28 |
| Durability | 8.6 | 7.9 | +0.7 (S/Lab Genesis higher by 0.7) | #1/28 |
| Meta-Score | 83strong | 80contender | +3.0 | Calibrated |
The Runner's Pick
Final Decision: Who Buys Which Model?
Side-by-side selection criteria grounded in verified mechanical specs
Salomon
S/Lab Genesis
83
Choose the S/Lab Genesis if:
Choose the S/Lab Genesis if your priority is a secure, planted base with confident guidance powered by EnergyFoam and a noticeably lighter weight (258g vs 284g). It is the better match for runners targeting neutral support and surefooted stride containment over the Ultra Glide 4's focus on high-mileage protection and low-impact recovery cruising.
8mm drop · 258g · $200Audit
Salomon
Ultra Glide 4
80
Choose the Ultra Glide 4 if:
Choose the Ultra Glide 4 if your priority is plush impact absorption and deep underfoot comfort powered by optiFOAM supercritical EVA/TPE blend midsole (284g). It is the better match for runners targeting high-mileage protection and low-impact recovery cruising over the S/Lab Genesis's focus on minimizing leg fatigue across late-mile splits.
6mm drop · 284g · $160Audit
Quiver Overlap
Direct Trail Rivals
2-Shoe Rotation Strategy
Both models occupy the exact same trail slot on your shoe rack. Rather than buying both, runner consensus suggests picking the lighter S/Lab Genesis (258g) for quicker cadence, or the Ultra Glide 4 for its optiFOAM supercritical EVA/TPE blend midsole ride feel and structure.
S/Lab Genesis RoleTrail Workhorse
Ultra Glide 4 RoleAlternative Trail
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