A footwear for wrapping an entire foot includes a t lain body made of foam rubber. The main body is dug to embed synthetic rubber into a heel side of a bottom of the min body made of the foam rubber. The embedded part is a part from a mid point from a toe to a heel to a heel part of the bottom of the main body. Specific gravities of the foam rubber and the synthetic rubber are 0.38 g/cm.sup.3 and 1.03 g/cm.sup.3, respectively. A center of gravity of the footwear is shifted to the heel side using a difference in the specific gravity of both to increase stability such that the footwear does not fall over when the footwear is placed upside down. An opening of the footwear is further formed to be flat with respect to a ground surface when the footwear is placed upside down.

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 impact absorbing footwear device employs opposed planar sole portions engaged by a selective resistance coupling that biases the opposed planar sole portions in a non-linear manner in response to forces exerted by the wearer against the sole portion in frictional contact with a floor surface. The planar sole portions are disposed in a footwear appliance that takes the form of an athletic shoe sole. The selective resistance coupling includes a plurality of resilient deformation members that engage the planar sole portions in an opposed circumferentially aligned manner, selectively deform in response to pressure exerted by the wearer for preventing ACL and other impact related injuries, and recover to an undeformed rest position without breakaway to allow the wearer uninterrupted usage while dampening forces that surpass an injury threshold from the resilient deformation that allows the planar sole portions to temporarily misalign.

A work shoe, in particular for use in leveling work and/or filling work and/or for aerating a lawn, is designed such that a wearer's foot can be introduced into the shoe via an opening and the work shoe is provided with downwardly projecting spacer elements.

A footwear includes: a foot bed portion that supports a sole of a foot of a wearer and has a ground contact surface; and a foot cover portion that covers an instep of the foot of the wearer. At least a part of the foot bed portion and at least a part of the foot cover portion are formed of a single additively manufactured product produced by a stereolithography-type three-dimensional additively manufacturing method, and a protruding portion is provided on an outer surface defined by the additively manufactured product of the foot cover portion.

A footwear includes: a foot bed portion that supports a sole of a foot of a wearer and has a ground contact surface; and a foot cover portion that covers an instep of the foot of the wearer. At least a part of the foot bed portion and at least a part of the foot cover portion are formed of a single additively manufactured product produced by a stereolithography-type three-dimensional additively manufacturing method, and a protruding portion is provided on an outer surface defined by the additively manufactured product of the foot cover portion.

An outsole for an article of footwear with a forefoot region, a midfoot region, a heel region, a medial side, and a lateral side. The outsole can include a ground engaging surface with a plurality of cleats and a plurality of circular ridges including a first set of circular ridges and a second set of circular ridges. The first set of circular ridges can be concentrically aligned about a first epicenter in the forefoot region and the second set of circular ridges can be concentrically aligned about a second epicenter in the heel region. The plurality of cleats can include a first set of cleats in the forefoot region that can be aligned along a first circular ridge of the first set of circular ridges.