An article of footwear includes an upper and a closure mechanism. The upper has an opening at least partially located between a first and second portions of the upper. The opening is adjustable between open and closed configurations. The closure mechanism is moveable between unlocked and locked positions and includes a locking element coupled to the first portion of the upper and a projection coupled to the second portion of the upper. The projection is moveable in a first direction relative to the locking element to engage with the locking element, thereby moving the closure mechanism to the locked position and moving the upper to the closed configuration. The projection is moveable in the first direction relative to the locking element to disengage with the locking element, thereby moving the closure mechanism to the unlocked position and allowing the upper to return to the open configuration.

A device includes a cleat and a receiver. The cleat is mountable to a shoe and includes a front portion and a rear footing. The receiver is mountable to a support of an external device. The receiver includes a frame including a front portion and a rear portion, with the rear portion configured to removably slidably receive the rear footing of the cleat. The front portion of the receiver includes a catch element, which is pivotally movable relative to the frame while under a rotational biasing force in a first orientation, to permit slidable entry of, and retention of, the front portion of the cleat relative to the frame of the receiver.

A device includes a cleat and a receiver. The cleat is mountable to a shoe and includes a front portion and a rear footing. The receiver is mountable to a support of an external device. The receiver includes a frame including a front portion and a rear portion, with the rear portion configured to removably slidably receive the rear footing of the cleat. The front portion of the receiver includes a catch element, which is pivotally movable relative to the frame while under a rotational biasing force in a first orientation, to permit slidable entry of, and retention of, the front portion of the cleat relative to the frame of the receiver.

The footwear includes a base having a toe portion, a heel portion opposing the toe portion, a base left and right side, and a bottom surface to engage the ground when worn by a user. The footwear additionally includes a base top surface opposing the base bottom surface, a toe box permanently coupled to the toe portion of the base at the top surface, and a counter permanently coupled to the heel portion of the base at the top surface. The footwear further includes a left and right support structure permanently coupled to the top surface of the base between the toe box and the counter on each side of the base, and a detachable left and right panel configured to detachably connect to the respective left and right support structure.

The footwear includes a base having a toe portion, a heel portion opposing the toe portion, a base left and right side, and a bottom surface to engage the ground when worn by a user. The footwear additionally includes a base top surface opposing the base bottom surface, a toe box permanently coupled to the toe portion of the base at the top surface, and a counter permanently coupled to the heel portion of the base at the top surface. The footwear further includes a left and right support structure permanently coupled to the top surface of the base between the toe box and the counter on each side of the base, and a detachable left and right panel configured to detachably connect to the respective left and right support structure.

The footwear includes a base having a toe portion, a heel portion opposing the toe portion, a base left and right side, and a bottom surface to engage the ground when worn by a user. The footwear additionally includes a base top surface opposing the base bottom surface, a toe box permanently coupled to the toe portion of the base at the top surface, and a counter permanently coupled to the heel portion of the base at the top surface. The footwear further includes a left and right support structure permanently coupled to the top surface of the base between the toe box and the counter on each side of the base, and a detachable left and right panel configured to detachably connect to the respective left and right support structure.

The footwear includes a base having a toe portion, a heel portion opposing the toe portion, a base left and right side, and a bottom surface to engage the ground when worn by a user. The footwear additionally includes a base top surface opposing the base bottom surface, a toe box permanently coupled to the toe portion of the base at the top surface, and a counter permanently coupled to the heel portion of the base at the top surface. The footwear further includes a left and right support structure permanently coupled to the top surface of the base between the toe box and the counter on each side of the base, and a detachable left and right panel configured to detachably connect to the respective left and right support structure.

A footwear system including a first footwear article configured to accept a user's foot, the first footwear article having a body and a sole attached to the body, the sole having a flange member extending past the body forming a wing, and a second footwear article, the second footwear article comprising a sole having a raised ridge portion and a raised heel portion, the raised ridge portion and the raised heal portion forming a cavity configured to accept the wing of the first footwear article, wherein the second footwear article is configured to be detachably attached to the first footwear article.

A footwear system including a first footwear article configured to accept a user's foot, the first footwear article having a body and a sole attached to the body, the sole having a flange member extending past the body forming a wing, and a second footwear article, the second footwear article comprising a sole having a raised ridge portion and a raised heel portion, the raised ridge portion and the raised heal portion forming a cavity configured to accept the wing of the first footwear article, wherein the second footwear article is configured to be detachably attached to the first footwear article.

Articles of footwear may include an upper formed from one or more upper parts, wherein at least one upper part defines an ankle-containing portion of the upper and at least one upper part (the same upper part or a different upper part) defines an instep-containing portion of the upper. The foot-insertion opening of the upper (which may include a closure system) may extend: (i) from a first side of an ankle-containing portion of the upper, (ii) around a rear heel or ankle area of the upper, (iii) along a second side of the ankle-containing portion of the upper, and (iv) to an instep-containing portion of the upper. One or more additional straps (e.g., an ankle strap, one or more interior bootie straps, etc.), fasteners, and/or locks may be provided to engage the upper/footwear with the wearer's foot.