Ankle boots are any styling of boot where the shaft of the boot ends at the ankle line on the wearer. Ankle boots shaft height will typically measure up to 4 1/2".
About PORON:
PORON® is a trademark name that describes a high density, sponge-like polyurethane which offers excellent compression resistance and high impact absorption. Among its many applications, PORON® is used in the footwear industry to manufacture a special kind of support insert that provides extra cushioning, support, and helps improve comfort.