an article of footwear , especially a clog has a basic structure including an upper , a sole portion and a heel molded as a unitary article , for example , by high pressure injection molding ; in this way a lightweight article can be produced without the need for separate manufacturing steps to attach the three basic components ; conveniently the article of footwear includes a separately formed insole member having a cavity to receive a replaceable arch support member which can be shaped and formed to meet the specific needs of the wearer .