The Adidas Adizero SL2 and Saucony Endorphin Speed 6 are both neutral road running shoes with moderate cushioning. The Adizero SL2 is 0.9 oz lighter (7.3 oz vs 8.2 oz) and costs about $128 less (from $52). The Endorphin Speed 6 sits higher off the ground (38 mm vs 35 mm heel stack).
Bottom line: Pick the Adizero SL2 if you want the lighter shoe; pick the Endorphin Speed 6 if you want more foam under your heel.
Specs side by side
| Spec | Adizero SL2 | Endorphin Speed 6 |
|---|---|---|
| Price | $52 | $180 |
| Rating | 4.7 / 5 (482 reviews) | — |
| Weight | 7.3 oz | 8.2 oz |
| Heel-to-toe drop | 9 mm | 8 mm |
| Heel stack height | 35 mm | 38 mm |
| Cushioning | Moderate | Moderate |
| Support | Neutral | Neutral |
| Surface | Road | Road |
| Available for | Women | Men & Women |
Specs and prices from Adidas and Saucony, checked 2026-11-02. Weight is usually for a men's size 9–10.
Which should you get?
Get the Adizero SL2 if…
- you want the lighter shoe
- you want to spend less
- you like feeling closer to the ground
Get the Endorphin Speed 6 if…
- you want more foam under your heel
More comparisons
- Adidas Adizero SL2 vs Saucony Endorphin Pro 5
- Adidas Adizero SL2 vs Nike Interact Run
- Adidas Adizero SL2 vs Nike Run Defy
- Saucony Endorphin Speed 6 vs ASICS GEL-PULSE 17
- Saucony Endorphin Speed 6 vs ASICS SUPERBLAST 3
- Saucony Endorphin Speed 6 vs Saucony Endorphin Pro 5 Speed-lace
- Saucony Endorphin Speed 6 vs ASICS SONICBLAST 2