An article of footwear includes an upper with a forward covering portion and a rearward covering portion. The rearward covering portion can be adjusted between an open configuration for receiving a foot and a closed configuration for covering the foot. In the open configuration the rearward covering portion is approximately flat, while in the closed configuration the rearward covering portion has a three-dimensional shape. The rearward covering portion may be folded vertically between the open configuration and the closed configuration. A tensioning member can be used to control the configuration of the rearward covering portion.