School · Shoes, explained · 35 s .
Weight
Why every 100 g counts.
Lab studies found that adding 100 g to each shoe costs runners about 1% in energy at the same pace.
That's why race shoes chase every gram, and why the lightest are also the most fragile.
For daily training, a bit more weight buys durability and protection. Compare weights in the same size: shoe weights are usually given for a men's US 9 or 10.
Light for speed, a little heavier for kilometres.
Quick check .
According to studies, what do an extra 100 g per shoe cost?
At the same pace, about 100 g more per shoe costs around 1% more energy.