The universal shoe tying technique of a rabbit perpetually running around a tree works great when you're 5. However, as most runners have experienced, shoes can be a source of discomfort and even sometimes pain.

The toe box is the part of a shoe that covers and protects the toes. Toe boxes come in a variety of shapes and styles depending on the type of shoe, but they should always be wide and long enough to accommodate the toes comfortably.

A shoe tongue is a strip of leather or other material located under the laces of a shoe.

An internal support feature in the rear of the shoe that conforms to the shape of your heel.

The material (usually EVA or Polyurethane foam) that sits below the upper and above the outsole, providing protection from impact forces and oftentimes encasing nonfoam technologies, such as GEL or Air, to increase durability and protection.