It is much easier to pull on boots when seated. You will hear a soft "plop" when the foot drops into the boot. Now have your customer stand to determine proper fit.

The ball of the foot should be the widest part of the boot's outsole. When standing, the boot shank and arch of the foot should have matching curves.

There are two tests to determine whether or not your boots have ample toe room. First run your finger over the smaller toes' area to see if the toes touch softly against the leather. Make sure to be standing is standing. If the smaller toes extend beyond the stitching line of the welt, or if the toes cause a bump, the boots are too short. Try a larger size.

You can determine if your boots fit across the instep by taking the leather between your thumb and index finger and rubbing your thumb across the instep. If the boots are too loose, a large wrinkle will appear. A slight wrinkle means the boots fit properly.

5. HEEL SLIPPAGE: 

Heel Slippage is normal and does not mean the boots are not fitted properly. After the boots have been worn and the outsole flexed a few times heel slippage should stop giving you a comfortable wearing boot.