Ankle Height: The distance between the midsole and the topline collar where your ankle bones sit.
Back Height: The distance on the back of the heel between the midsole and the topline collar.
Back Tabs: The rear portion of the shoe where the top of the heel makes contact with the back of the ankle.
Eyerow: The part of the shoe where the laces connect to the upper. The eyerows should be parallel along the top of the foot.
Forefoot Flex: The area across the forefoot where the shoe flexes. The shoe flexes along the sole unit and the upper.
Forefoot: The front section of the shoe extending from the forefoot flex to the tip of the shoe.
Midfoot/Waist: The middle section of the shoe under the laces. This section extends from the back of the arch to the forefoot.
Midsole: The thick layer between the outsole and the insert. A shoe’s stability and cushioning properties are based on the construction of the midsole.
Outsole: The treaded layer of the shoe that makes direct contact with the ground.
Toebox: The volume of the forefoot that contains the toes. The height and width of the toebox can differ between shoe models.
Tongue: The padding under the laces that protects the top of the foot.
Topline Collar: The top portion of the shoe’s opening that makes contact with the ankle.