If the tops of the toes are involved, the cap is too low or too stiff. If the ends of the toes are affected, the boot is too short or too loosely laced. If the sides of the big and little toes become irritated, the boot is too narrow. Irritation at the heel is caused by boots being too long, too loosely laced, or too wide a heel space. Proper lacing of boots not only prevents blisters but also prevents improper blood flow in the foot.
Laces can assume a seesaw action, which can produce a long blister across the instep.
To prevent blistering, lacing over the instep can be avoided. If possible, broad laces should be used and an extra pair should be carried. The wool cushion-sole sock is best because it offers good foot protection. Those that are too large wrinkle inside the shoe, rub the feet, and cause blisters and abrasions. Socks that are too small wear quickly and reduce blood flow in the foot.