A shoe including a sole and a shoe upper, the shoe upper including a shoe opening for entering the shoe, the shoe opening defined by a rear part, a medial part, a lateral part, and a front part, the rear part including a top portion, reinforced by a firm material, an optional bottom portion reinforced by a firm material, a center portion, located between the top portion and the bottom portion, the center portion made of a flexible material, and a spring element. The top part of the spring element being attached to the top portion of the rear part, and the bottom part of the spring element being attached to either the bottom portion of the rear part, or to the sole.

An article of footwear includes a decoupled foot stabilizer system. The foot stabilizer system is decoupled from a midfoot region of the article of footwear. The foot stabilizer system includes a plurality of strap members. The foot stabilizer system may optionally include a bootie. The plurality of strap members extend underneath a portion of a foot of a wearer. The plurality of strap members are configured to receive a lace at one end. A lace running through the ends of the strap members pulls on the strap members when the lace is tightened and causes the foot stabilizer system to conform to the wearer's foot.

Boot shafts can be designed for comfort by providing expansion in the shaft of a boot. Portions of a shaft can be replaced, augmented, or associated with a more deformable and elastically resilient material or materials. When effectively associated or integrated, the elastic material can allow for temporary expansion of the shaft to ease passage of the heel and foot through the shaft and into the shoe box. A long thin resilient feature can provide expansion and ease of passage of a foot down the boot shaft while also potentially minimizing conspicuous departure from conventional stylings. Such features can also be physically obscured with straps (which may rotate, for example). Such features may be curved or angled to visually in fit with and even be camouflaged by surrounding decorative ornamentation on the shaft of such a boot.

A shoe device having bimodal structures, configured to selectively snap the device to at least one of a second position and a first position, which selectively snaps the shoe into a first position upon being subjected to a first bending force, apt for placement or removal of a foot, and selectively snaps the shoe into a second position upon being subjected to a second bending force, apt for securement of a foot or having no foot. A forward leaning, flexible stadium arch structure, assembled to form a heel notch mechanism, connects to a sole. A morphing shoe collar portion connects to a heel. These are combined via vector changing devices for greater functionality.

An article of footwear includes an intermediate covering portion with an adjustable volume. The intermediate covering portion is closed around the instep of the foot. The article also includes a tensioning system that can be used to change the volume of the intermediate covering portion. The tensioning system includes a tension balancing member to balance loads across different portions of the intermediate covering portion.

A bimodal heel counter apt for a rapid entry and release footwear devices, that includes a flexible hollow hemisphere portion, a heel tab, a secondary heel tab, a back sole base, an anchor system, and dependent fastening elements. The bimodal heel counter and dependent fastening systems are biased to one of two stable positions, which elastically morphs by stored potential energy with applied force from one position to the other, configured to collectively snap a footwear device between an open and closed position, for donning and doffing, or securing the foot as to enable active footwear use.

A rapid-entry shoe having a heel arm configured to transition between a collapsed configuration, for easy donning and doffing of the shoe, and an uncollapsed configuration, for securing a foot inside the shoe, the shoe having a resilient member configured to bias the heel arm toward the uncollapsed configuration.

A boot comprises: an outsole and a polymeric upper affixed to the outsole. The upper comprises an upper body and a gusset, which comprises a relaxed position and an expanded position, wherein the gusset moves from the relaxed position to the expanded position to accommodate a wearer's leg upon donning of the boot.

A shoe including a sole and a shoe upper, the shoe upper including a shoe opening for entering the shoe, the shoe opening defined by a rear part, a medial part, a lateral part, and a front part, the rear part including a top portion, reinforced by a firm material, an optional bottom portion reinforced by a firm material, a center portion, located between the top portion and the bottom portion, the center portion made of a flexible material, and a spring element. The top part of the spring element being attached to the top portion of the rear part, and the bottom part of the spring element being attached to either the bottom portion of the rear part, or to the sole.

An article of footwear includes a sole and an upper. The upper includes a restrictive fabric portion. The restrictive fabric portion includes elastic and restrictive strands. A restrictive-side resistance index is greater than an elastic-side resistance index, when a tensile load is applied to the restrictive fabric portion in a direction of stretching the elastic and restrictive strands, where the restrictive-side resistance index is a ratio of an increase in tensile stress to an increase in rate of stretch of the restrictive strand, in a range in which a rate of stretch of the restrictive fabric portion is greater than a predetermined value, and the elastic-side resistance index is a ratio of an increase in tensile stress to an increase in rate of stretch of the elastic strand, in the range in which the rate of stretch of the restrictive fabric portion is greater than the predetermined value.