Head-to-Head
Adizero Boston 13vsGlycerin Flex
The Adizero Boston 13 is a speed trainer shoe while the Glycerin Flex is a daily trainer shoe. The Adizero Boston 13 retails for $160 while the Glycerin Flex comes in at $170 — a $10 difference. The Adizero Boston 13 is the lighter shoe at 9.0 oz versus 9.1 oz for the Glycerin Flex. In our ratings, the Adizero Boston 13 edges out the Glycerin Flex — 9.2/10 versus 8.0/10.
| Rating | 9.2 / 10✓ | 8.0 / 10 | |
| Price | $160✓ | $170 | |
| Weight | 9.0 oz✓ | 9.1 oz | |
| Category | Speed Trainer | Daily Trainer | |
| Terrain | Road | Road | |
| Cushion | Medium | Medium | |
| Softness | Balanced | Balanced | |
| Drop | Medium | Medium | |
| Drop (mm) | 6 mm | 6 mm | |
| Stack | 36 mm | 36 mm | |
| Stability | Neutral | Neutral | |
| Fit | Narrow | Narrow | |
| Energy Return | Medium✓ | Low | |
| Breathability | Medium | Medium | |
| Traction | Medium | High✓ | |
| Shock Absorption | Medium | High✓ | |
| Durability | Very Good✓ | Good |
