Abstract: An article of infant footwear includes a sole made of a flexible, compliant layer of material with a thickness of between about 1 mm and about 3 mm. The article of infant footwear includes an upper attached to the sole, the upper and the sole together define a void to receive a foot. The upper has a heel cap independently movable relative to a remaining portion of the upper. The article of infant footwear further includes lateral and medial expanders. The lateral expander has a first end attached to a lateral heel portion of the upper and a second end attached to the heel cap. The medial expander has a first end attached to a medial heel portion of the upper and a second end attached to the heel cap. Each expander independently moves between a relaxed state and a stretched state to accommodate receipt of the infant foot.

Abstract: An article of infant footwear includes a sole made of a flexible, compliant layer of material with a thickness of between about 1 mm and about 3 mm. The article of infant footwear includes an upper attached to the sole, the upper and the sole together define a void to receive a foot. The upper has a heel cap independently movable relative to a remaining portion of the upper. The article of infant footwear further includes lateral and medial expanders. The lateral expander has a first end attached to a lateral heel portion of the upper and a second end attached to the heel cap. The medial expander has a first end attached to a medial heel portion of the upper and a second end attached to the heel cap. Each expander independently moves between a relaxed state and a stretched state to accommodate receipt of the infant foot.

Abstract: A footbed promotes complimentary movement and proprioceptive feedback of a user's foot (e.g., to help an adult balance on an uneven surface) while wearing the article of footwear. The footbed includes a base and a plurality of pads. The base has a first side opposite a second side, each extending from a forefoot region to a heel region. A first portion of each pad extends away from the first side of the base and a second portion of each pad extends away from the second side of the base. The second side of the base is positionable adjacent to an outsole of an article of footwear such that the first side of the base is adjacent a user's foot during use of the article of footwear. Each pad is movable substantially independently of the each of the other pads, relative to the base.

Abstract: An article of footwear that includes a sole and an upper attached to the sole. The upper comprises at least one alterable portion that switches between at least a first state and a second state upon exposure to a liquid. The first state allows viewing of a first image of the alterable portion and second state allowing viewing of a second image of the alterable portion.

Abstract: An article of footwear including a footwear upper and a sole assembly secured to the footwear upper. The sole assembly has a forefoot portion and a heel portion, and includes an outsole, a midsole disposed on the outsole and an instability insert disposed between the outsole and the midsole in the forefoot portion of the sole assembly. The instability insert causes a forefoot protrusion to be defined by the outsole in the forefoot portion of the sole assembly.

Abstract: An article of footwear including a footwear upper and a sole assembly secured to the footwear upper. The sole assembly has a forefoot portion and a heel portion, and includes an outsole, a midsole disposed on the outsole and an instability insert disposed between the outsole and the midsole in the forefoot portion of the sole assembly. The instability insert causes a forefoot protrusion to be defined by the outsole in the forefoot portion of the sole assembly.