Heel-to-toe drop at a glance
- Zero drop
- 0 mm
- Low drop
- 1 to 4 mm
- Traditional
- 8 to 12 mm
How drop is calculated
If a shoe is 32 mm at the heel and 24 mm at the forefoot, it has 8 mm of drop. That's the whole definition. It says nothing about cushioning, which is stack height, and the two get confused constantly.
What drop changes in your legs
Drop changes which tissues do the work. A higher heel puts the ankle in a slightly plantarflexed position, taking some stretch off the calf and Achilles and shifting load towards the knee. Lower drop does the reverse, loading the calf and Achilles more and the knee less. Neither arrangement is correct in the abstract, and the research on injury rates has not settled the question.
Why changing drop quickly hurts
What is well established is that changing drop quickly causes problems. Going from 10 mm to zero moves load onto a calf and Achilles that haven't adapted to it, and Achilles tendinopathy is the common result. If you're switching, do it over weeks, and keep the old pair for your longer days while you adjust.
Typical drops by category
Traditional running and hiking shoes sit around 8 to 12 mm. The trail running market has drifted lower and now spans zero to about 8 mm, with several brands built entirely around zero drop. Hiking boots tend to stay higher, often 8 to 14 mm, partly because a raised heel suits carrying a load.
None of those bands is correct in the abstract. What matters is the distance between your current shoes and the ones you are considering.
How to change drop without hurting yourself
Move in steps of about 4 mm and give each step at least a few weeks. Dropping the heel lengthens the calf and Achilles under load, and those tissues adapt on a slower timescale than your enthusiasm for the new shoes.
Keep the old pair in rotation while you transition, use the new pair for shorter and flatter outings first, and treat any calf tightness or Achilles soreness as a signal to slow down rather than push through. Most drop-related injuries come from switching in one step.
What this means when you're choosing
- Both stack figures, since drop is the difference and neither number alone tells you
- A change of no more than about 4 mm from what you currently run
- Consistency across your rotation rather than mixing extremes
The common mistake
Switching drop overnight
The calf and Achilles adapt slowly. Dropping several millimetres in one purchase and then doing a normal week's mileage is a reliable way to end up with Achilles pain that takes months to settle.
Common questions
What drop should I hike in?
Whatever you're already adapted to. If your current shoes don't cause you trouble, match their drop. There's no evidence that a particular number is better for hiking generally.
How long does it take to adapt to lower drop?
Several weeks at least, and longer if you're covering real distance. Introduce the new drop on short walks first and keep the mileage in your old pair while the calf catches up.