What is Upper breathability & fit?
Engineered mesh, knit, toe box width.
Short answer
Try shoes in the evening with your running socks on.
Upper breathability & fit when buying a running shoes
Engineered mesh, knit, toe box width.
Why it matters: Feet swell up to half a size during a run; a tight toe box causes black toenails.
Look for: Try shoes in the evening with your running socks on.
Full Running Shoes buying guide