Head-to-Head
Wave Sky 9vsGlycerin Flex
The Wave Sky 9 is a recovery / easy run shoe while the Glycerin Flex is a daily trainer shoe. The Wave Sky 9 retails for $180 while the Glycerin Flex comes in at $170 — a $10 difference. The Glycerin Flex is the lighter shoe at 9.1 oz versus 10.0 oz for the Wave Sky 9. In our ratings, the Wave Sky 9 edges out the Glycerin Flex — 9.0/10 versus 8.0/10.
| Rating | 9.0 / 10✓ | 8.0 / 10 | |
| Price | $180 | $170✓ | |
| Weight | 10.0 oz | 9.1 oz✓ | |
| Category | Recovery / Easy Run | Daily Trainer | |
| Terrain | Road | Road | |
| Cushion | High | Medium | |
| Softness | Soft | Balanced | |
| Drop | Medium | Medium | |
| Drop (mm) | 6 mm | 6 mm | |
| Stack | 44 mm | 36 mm | |
| Stability | Neutral | Neutral | |
| Fit | Medium | Narrow | |
| Energy Return | Low✓ | Low✓ | |
| Breathability | Medium | Medium | |
| Traction | High | High | |
| Shock Absorption | High | High | |
| Durability | Good | Good |
