Head-to-Head
SonicblastvsGlycerin Flex
The Sonicblast is a speed trainer shoe while the Glycerin Flex is a daily trainer shoe. The Sonicblast retails for $180 while the Glycerin Flex comes in at $170 — a $10 difference. The Sonicblast is the lighter shoe at 9.0 oz versus 9.1 oz for the Glycerin Flex. In our ratings, the Sonicblast edges out the Glycerin Flex — 9.1/10 versus 8.0/10.
| Rating | 9.1 / 10✓ | 8.0 / 10 | |
| Price | $180 | $170✓ | |
| Weight | 9.0 oz✓ | 9.1 oz | |
| Category | Speed Trainer | Daily Trainer | |
| Terrain | Road | Road | |
| Cushion | High | Medium | |
| Softness | Balanced | Balanced | |
| Drop | Medium | Medium | |
| Drop (mm) | 8 mm | 6 mm | |
| Stack | 46 mm | 36 mm | |
| Stability | Neutral | Neutral | |
| Fit | Narrow | Narrow | |
| Energy Return | Medium✓ | Low | |
| Breathability | Breathable✓ | Medium | |
| Traction | High | High | |
| Shock Absorption | High | High | |
| Durability | Decent | Good✓ |
