Attachment system for securing footwear

An item of footwear comprising:

• an upper comprising a first portion and a second portion;
• and
• an attachment system, comprising:
• a buckle assembly comprising a clasp adapted to be coupled to the first portion of the upper, the clasp comprising an elongated portion having an integrated curved element, the integrated curved element including an at least partially spherical portion;
• and
• a receiver pivotally coupled to the second portion of the upper such that the receiver is movable between an open position and a closed position, the receiver comprising an elongated recess adapted to slidably receive the elongated portion, the elongated recess defining a socket adapted to house the at least partially spherical portion of the integrated curved element, wherein the elongated recess securely holds the elongated portion in a longitudinal direction of the attachment system, and wherein engagement between the socket and the integrated curved element facilitates pivotal movement of the clasp within the elongated recess in a transverse direction of the attachment system such that the first portion and the second portion secure the footwear to the wearer while facilitating relative movement in the transverse direction between the buckle assembly and the receiver;
• wherein the at least partially spherical portion defines a depression configured to house a fastener that is positioned to attach the receiver to the second portion of the upper.