A shoe in form of a slipper or sandal, includes a body 100 adapted to have a first fluid casing 12 and a second fluid casing 14, each having an elastic property, embedded in the front and rear portions of the body, respectively, and an instep strap 120 supported to the body in such a way as to be rotated in a specific section. A rotating shaft 16 is rotated in conjunction with the instep strap, and it includes a first connecting portion connected to the first fluid casing and a second connecting portion connected to the second fluid casing and an internal passage having respective check ball seating portions formed on the inside of the first and the second connecting portions, and with check ball received in the internal passage. When the rotating shaft is inclined by rotation of the rotating shaft, the check ball closely adheres to any one of the check ball seating portions by gravity or buoyancy and regulates a fluid flow to any one of the first and the second connecting portions.

A shoe in form of a slipper or sandal, includes a body 100 adapted to have a first fluid casing 12 and a second fluid casing 14, each having an elastic property, embedded in the front and rear portions of the body, respectively, and an instep strap 120 supported to the body in such a way as to be rotated in a specific section. A rotating shaft 16 is rotated in conjunction with the instep strap, and it includes a first connecting portion connected to the first fluid casing and a second connecting portion connected to the second fluid casing and an internal passage having respective check ball seating portions formed on the inside of the first and the second connecting portions, and with check ball received in the internal passage. When the rotating shaft is inclined by rotation of the rotating shaft, the check ball closely adheres to any one of the check ball seating portions by gravity or buoyancy and regulates a fluid flow to any one of the first and the second connecting portions.

A sole structure may include chambers and a transfer channel containing an electrorheological fluid. Electrodes may be positioned to create, in response to a voltage across the electrodes, an electrical field in at least a portion of the electrorheological fluid in the transfer channel. The sole structure may further include a controller including a processor and memory. At least one of the processor and memory may store instructions executable by the processor to perform operations that include maintaining the voltage across the electrodes at one or more flow-inhibiting levels at which flow of the electrorheological fluid the through the transfer channel is blocked, and that further include maintaining the voltage across the electrodes at one or more flow-enabling levels permitting flow of the electrorheological fluid through the transfer channel.

An article of footwear includes an upper and a sole structure. The upper includes elongated members extending from a lower peripheral portion that mechanically connect the upper to a sole structure. The sole structure includes several recesses for engaging the elongated members. The upper and/or the elongated members can be printed using a three-dimensional printer.

An article of footwear having a sole member is disclosed. The sole member includes an outsole defining a ground-contacting portion of the sole member; an insole defining a foot-contacting portion of the sole member; and a fastening member coupled to a peripheral edge of at least one of the outsole and the insole. The fastening member includes a body with a hook arm protruding from a portion of the body, the hook arm and the portion together disposed above the insole and defining a discontinuous gap in the body; and a coupling strap with a first end and a second end opposite the first end, the first end extending outwardly from the peripheral edge and the second end coupled to the portion of the body.

An article of footwear includes an upper and a sole. The upper includes an attachment region and a bottom portion that is bounded by the attachment region. The sole defines a concave inner surface. The concave inner surface includes a peripheral surface region and a central surface region. The attachment region of the upper is attached to the peripheral surface region of the sole. The bottom portion is held in tension over the central surface region.

A shoe including an upper comprising an outersole, a toe portion, and a rigid plate; and a heel comprising a threaded shaft upwardly extending therefrom, wherein the rigid plate comprises a threaded barrel comprising a lower open end and an upper closed end opposite therefrom, and wherein the heel is removably attached to the upper based on the threaded shaft threading into the threaded barrel from the lower open end to the upper closed end, and wherein the rigid plate extends over the heel when the heel is removably attached to the upper, and wherein the rigid plate extends past the heel towards the toe portion along the outersole.

A shoe including an upper comprising an outersole, a toe portion, and a rigid plate; and a heel comprising a threaded shaft upwardly extending therefrom, wherein the rigid plate comprises a threaded barrel comprising a lower open end and an upper closed end opposite therefrom, and wherein the heel is removably attached to the upper based on the threaded shaft threading into the threaded barrel from the lower open end to the upper closed end, and wherein the rigid plate extends over the heel when the heel is removably attached to the upper, and wherein the rigid plate extends past the heel towards the toe portion along the outersole.

A modular footwear having individual versatility is provided comprising an insole for primary support and a sole provided thereon. The footwear further comprises a heel provided on the insole having a heel counter provided on an upper periphery of the heel and wherein the insole defines a channel for receiving an attachment means to securely attach the footwear to the individual.