Rubber sole from a shoe.
Soles are the lowest part of a shoe, both in height and in social status. In height, soles make up the bottom of the shoe and are the part that makes direct contact with the wearer's feet and the ground. Rubber or polyurethane are typically used to make soles as they are good at absorbing shocks and jolts, which can protect one's feet from a harsh landing. In social status, the soles of a shoe are considered unclean as they frequently touch the dirty, dusty ground. In Arab and Asian cultures, showing the soles of one's shoes is considered extremely disrespectful, and an apology should be in order should one find themselves accidentally doing so.
Can be removed from any shoe.