A method of manufacturing a midsole for an article of footwear includes cutting a pattern of openings at least partway through a midsole with a cutting tool driven by an embroidery machine. An article of footwear includes a midsole defining a pattern of openings extending at least partway through the midsole. An inner surface of the midsole is contoured and the midsole includes upwardly-extending sidewalls. At least some of the openings extend relatively nonparallel with one another through the sidewalls and splay away from one another along longitudinal axes of the openings.

A method of manufacturing an article comprises etching an etched feature on a surface of a first polymeric sheet, and forming a fluid-filled bladder element from the first polymeric sheet, with the fluid-filled bladder element having a sealable internal cavity that retains fluid. The method includes assembling the bladder element in the article so that a first portion of the bladder element having the etched feature is exposed to view, and a second portion of the bladder element is blocked from view by the article. An article includes the bladder element with the etched feature.

A method of manufacturing an article comprises etching an etched feature on a surface of a first polymeric sheet, and forming a fluid-filled bladder element from the first polymeric sheet, with the fluid-filled bladder element having a sealable internal cavity that retains fluid. The method includes assembling the bladder element in the article so that a first portion of the bladder element having the etched feature is exposed to view, and a second portion of the bladder element is blocked from view by the article. An article includes the bladder element with the etched feature.

Present aspects are directed to an interlocking braided shoe and midsole system comprising a midsole insert having a plurality of protruding studs and a braided upper comprising a tubular containment structure. The tubular containment structure has a first zone comprising a first braid density and first braid configuration defining a plurality of apertures located on a top surface of the braided upper and a second zone having a second braid density and a second braid configuration defining a plurality of apertures located on the bottom surface of the braided upper. The plurality of apertures of the second braid configuration correspond to the plurality of protruding studs such that the plurality of protruding studs extend below an exterior surface of the braided upper through the plurality of apertures of the second braided configuration, coupling the bottom surface of the midsole insert with the braided upper.

Present aspects are directed to an interlocking braided shoe and midsole system comprising a midsole insert having a plurality of protruding studs and a braided upper comprising a tubular containment structure. The tubular containment structure has a first zone comprising a first braid density and first braid configuration defining a plurality of apertures located on a top surface of the braided upper and a second zone having a second braid density and a second braid configuration defining a plurality of apertures located on the bottom surface of the braided upper. The plurality of apertures of the second braid configuration correspond to the plurality of protruding studs such that the plurality of protruding studs extend below an exterior surface of the braided upper through the plurality of apertures of the second braided configuration, coupling the bottom surface of the midsole insert with the braided upper.

An article of footwear has an upper that is direct attached with the sole. The direct attach sole has an insert, such as an airbag, that forms a portion of a sidewall. The insert is externally visible and forms at least a portion of an external sidewall of the sole. The insert is formed into the direct attach sole by having the insert or a mask temporarily joined with the insert contact a sidewall molding surface of a mold used in the direct attach operation such that the insert results in forming a visible element of the direct attached sole.

A running shoe comprises an upper and a midsole attached to the upper, the midsole having a front portion corresponding to a forefoot and a rear portion corresponding to a heel. The front portion of the midsole may define a toe spring of at least 40 mm and a plurality of flex grooves, the plurality of flex grooves including one or more horizontal flex grooves and one or more longitudinal flex grooves, the horizontal flex groove(s) extending in a lateral to medial direction of the running shoe and allowing the front portion of the midsole to lie flat in response to application of less than 15 pounds of force against the toe spring, the longitudinal flex groove(s) extending in a front to back direction of the running shoe. The rear portion of the midsole may have a flat bottom that is narrower than the upper.

A sole structure for an article of footwear includes an upper layer formed of a first foam material and a lower layer formed of a second foam material and having a hardness that is greater than a hardness of the upper layer. In addition, a plate can be disposed between the upper layer and the lower layer, where the plate has a hardness that is greater than each of the upper and lower layers.

A sole structure for an article of footwear includes an upper layer formed of a first foam material and a lower layer formed of a second foam material and having a hardness that is greater than a hardness of the upper layer. In addition, a plate can be disposed between the upper layer and the lower layer, where the plate has a hardness that is greater than each of the upper and lower layers.

Aspects relate to a portable device that may be used to identify a critical intensity and an anaerobic work capacity of an individual. The device may utilize muscle oxygen sensor data, speed data, or power data. The device may utilize data from multiple exercise sessions, or may utilize data from a single exercise session. The device may additionally estimate a critical intensity from a previous race time input from a user.