Your Heel Should Stay Put
After properly lacing your shoes, make sure there is no more than 1/4" (6mm) heel lift when you walk around. A locked heel reduces the friction that causes blisters, and prevents your foot from moving forward on a downhill.
Support, But No Pressure
Outdoor footwear should hold your foot comfortably where you need it the most: toward the inside of the foot. Proper support prevents fatigue and injury.
Room to Wiggle
The toe box is the wiggle zone that lets your toes spread, move, and keep you stable. It's also the key to preventing cold toes. Count on blisters if your toes hit the front of your shoes.