Head-to-Head
Challenger 8vsGlycerin Flex
The Challenger 8 and Glycerin Flex are both daily trainer shoes built for trail running. The Challenger 8 retails for $155 while the Glycerin Flex comes in at $170 — a $15 difference. The Glycerin Flex is the lighter shoe at 9.1 oz versus 9.7 oz for the Challenger 8. In our ratings, the Challenger 8 edges out the Glycerin Flex — 9.0/10 versus 8.0/10.
| Rating | 9.0 / 10✓ | 8.0 / 10 | |
| Price | $155✓ | $170 | |
| Weight | 9.7 oz | 9.1 oz✓ | |
| Category | Daily Trainer | Daily Trainer | |
| Terrain | Trail | Road | |
| Cushion | High | Medium | |
| Softness | Soft | Balanced | |
| Drop | Medium | Medium | |
| Drop (mm) | 8 mm | 6 mm | |
| Stack | 42 mm | 36 mm | |
| Stability | Neutral | Neutral | |
| Fit | Medium | Narrow | |
| Energy Return | Low✓ | Low✓ | |
| Breathability | Breathable✓ | Medium | |
| Traction | Medium | High✓ | |
| Shock Absorption | High | High | |
| Durability | Very Good✓ | Good |
