TAKE THE TEST:
pull out an old running shoe and cut it open to see if you can identify the parts of a running shoe.
THERE ARE 2 MAIN PARTS:
Upper: covers the top/sides of the foot; holds foot in place and protects the foot. The upper:
- featherline: forms the edge where the toe guard meets the bottom of the shoe
- vamp: a single piece of material that gives shape to the shoe & forms the toe box
- tongue: protects the foot from direct contact with the laces
- collar: has an achilles tendon protector; top back of shoe
- foxing: shapes the rear end of the shoe
- heel counter: located underneath the foxing; supports the heel
Bottom/Sole: makes contact with the surface. The bottom/sole:
- insole: thin layer of EVA (ethylene vinyl acetate)
- midsole: this is the bulk of the the cushioning; it is usually polyurethene + gel or liquid silicone or foam; purpose: shock absorption
- outsole: carbon rubber (hard, think car tires) or blown rubber (softer, more flexible, less durable); purpose: traction & shock absorption
A person's foot strikes the ground about 1600 times/mile. After 200 miles, your shoe will start to break down and after 500 miles they probably need to be replaced.