Key takeaways
- Drop is the height difference (in mm) between a shoe's heel and forefoot.
- Higher drop (8–12mm) eases the calves/Achilles and suits heel strikers; lower drop (0–6mm) encourages a midfoot strike.
- Drop is separate from cushioning — a shoe can be low-drop and highly cushioned.
- Changing drop significantly should be done gradually to avoid injury.
What heel-to-toe drop is
Heel-to-toe drop — ‘drop’ or ‘offset’ — is the difference in height, in millimeters, between a shoe’s heel and its forefoot. A 10mm-drop shoe sits 10mm taller under the heel than the forefoot; a zero-drop shoe is level. It’s a key spec because it influences how your foot lands and where the load goes.
Why it matters
- Higher drop (8–12mm) — cushions the heel, eases the calves and Achilles; suits heel strikers and traditional runners.
- Lower drop (0–6mm) — encourages a midfoot/forefoot strike and a more natural posture; loads the lower leg more.
A runner with chronic calf tightness tries a higher-drop trail shoe to relieve the lower leg, while a friend chasing a more natural stride moves to a low-drop shoe — both shifting drop slowly over weeks so their legs adapt without injury.
Drop is not cushioning
A common confusion: drop is only the heel-to-forefoot difference, not how much foam is underfoot. A shoe can be low-drop and heavily cushioned, or high-drop and minimal. Check stack height separately. As with trail shoes generally, the best drop is individual — and any big change should be gradual.
The bottom line
Heel-to-toe drop — the mm difference between a shoe's heel and forefoot — shapes your foot strike and which muscles work hardest, with higher drop easing the calves and lower drop encouraging a midfoot landing. It's a preference, not a ranking, and it's separate from cushioning. Whatever drop you choose, change it gradually to let your body adapt and avoid injury.
Frequently asked questions
What is heel-to-toe drop?
Heel-to-toe drop is the difference in stack height between a shoe's heel and its forefoot, measured in millimeters. A 10mm-drop shoe sits 10mm higher under the heel than the forefoot. It's a key shoe spec because it influences how your foot lands and which muscles and joints take the load.
Does heel-to-toe drop affect injuries?
It can shift where stress goes: lower-drop shoes load the calves, Achilles, and forefoot more, while higher-drop shoes load the heel and can ease the lower leg. No single drop is universally best or 'injury-proof', but changing your drop too quickly is a known injury risk, so transitions should be gradual.
Is drop the same as cushioning?
No — they're independent. Drop is only the heel-to-forefoot height difference, while cushioning is how much foam is underfoot overall. A shoe can be low-drop with lots of cushion, or high-drop with little. Don't assume a low-drop shoe is minimal; check the stack height separately.
Sources
- Footwear & running mechanics — American Council on Exercise
- Trail running footwear — American Trail Running Association