Head-to-Head
Velocity Nitro 4vsGlycerin Flex
The Velocity Nitro 4 and Glycerin Flex are both daily trainer shoes built for road running. The Velocity Nitro 4 retails for $140 while the Glycerin Flex comes in at $170 — a $30 difference. The Velocity Nitro 4 is the lighter shoe at 8.0 oz versus 9.1 oz for the Glycerin Flex. In our ratings, the Velocity Nitro 4 edges out the Glycerin Flex — 8.8/10 versus 8.0/10.
| Rating | 8.8 / 10✓ | 8.0 / 10 | |
| Price | $140✓ | $170 | |
| Weight | 8.0 oz✓ | 9.1 oz | |
| Category | Daily Trainer | Daily Trainer | |
| Terrain | Road | Road | |
| Cushion | Medium | Medium | |
| Softness | Balanced | Balanced | |
| Drop | High | Medium | |
| Drop (mm) | 10 mm | 6 mm | |
| Stack | 36 mm | 36 mm | |
| Stability | Neutral | Neutral | |
| Fit | Narrow | Narrow | |
| Energy Return | High✓ | Low | |
| Breathability | Medium | Medium | |
| Traction | High | High | |
| Shock Absorption | Medium | High✓ | |
| Durability | Good | Good |
